Need help with PS Script to add Computers to Groups based on Computer Description

Hi all,

I'm looking for an alternative way to write my script to add any computer matching a filter, then adding a computer based on it's description, to a security group. All the computers that start with WS are being filtered. I'd like to grab the AD description field and then add that computer to a AD group based on its description. Heres what I have so far and it works, but the if statement nesting is nasty. Thanks for the help in advance!

Import-Module ActiveDirectory
Add-PSSnapin Quest.ActiveRoles.ADManagement -EA SilentlyContinue
$ErrorActionPreference="SilentlyContinue"
$workstations = Get-ADComputer -filter {(Name -like "WS*")} -Properties Description | Select-Object Name, Description | Sort-Object Name
foreach ($workstation in $workstations){
if ($workstation.Description -like "5ICU-RMC-5"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.5ICU.RMC"}
elseif ($workstation.Description -like "MHU-Adlt-RMC2"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.MHU.Adult.400Bldg"}
elseif ($workstation.Description -like "MHU-BSU-RMC2"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.MHU.BSU.400Bldg"}
elseif ($workstation.Description -like "MHU-GSU-RMC2"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.MHU.GSU.400Bldg"}
elseif ($workstation.Description -like "MHU-ChAdlt-RMC2"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.MHU.Child.400Bldg"}
elseif ($workstation.Description -like "MHU-Adlt-RMC2"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.MHU.Adult.400Bldg"}
elseif ($workstation.Description -like "Sound-400-302"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.SoundHospitalist.400Bldg"}
elseif ($workstation.Description -like "IS-RMC"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.IS.400Bldg"}
elseif ($workstation.Description -like "NSGAdm-400-305"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.NursingAdmin.400Bldg"}
elseif ($workstation.Description -like "BA-IS-400-407"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.BusinessAnalytics.400Bldg"}
elseif ($workstation.Description -like "RMG-NS-400-402"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.RMG.NeuroSurgery.400Bldg"}
elseif ($workstation.Description -like "RMG-PMR-400-400"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.RMG.PMR.400Bldg"}
elseif ($workstation.Description -like "EKG-400-500"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.EKG.ProcTesting.400Bldg"}
elseif ($workstation.Description -like "5Rehab-400-5"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.5Rehab.400Bldg"} 
elseif ($workstation.Description -like "IS-Info-401-StB"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.Informatics.401Bldg"}
elseif ($workstation.Description -like "MedRec-401-Bsmt"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.MedRec.401Bldg"}
elseif ($workstation.Description -like "WrdPrc-401-Bsmt"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.WordProc.401Bldg"}
elseif ($workstation.Description -like "Wound-401-Bsmt"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.WoundCtr.401Bldg"}
elseif ($workstation.Description -like "Ambulance-Atr"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.Ambulance.Atr"}
elseif ($workstation.Description -like "RehabOP-Atr"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.RehabSvcsOP.Atr"}
elseif ($workstation.Description -like "RMG-CorpH-Atr"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.CorpHealth.Atr"}
elseif ($workstation.Description -like "RMG-Pul-500-100"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.RMG.PulmCare.500Bldg"}
elseif ($workstation.Description -like "RMG-PSY-500-200"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.RMG.Psych.500Bldg"}
elseif ($workstation.Description -like "RMG-Nro-500-300"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.RMG.Neurology.500Bldg"}
elseif ($workstation.Description -like "RMG-Pul-500-300"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.RMG.Rheumotology.500Bldg"}
elseif ($workstation.Description -like "RMG-Pul-500-100"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.RMG.PulmCare.500Bldg"}
elseif ($workstation.Description -like "AIC-RMC-500"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.AIC.500Bldg"}
elseif ($workstation.Description -like "Cardiac-500-400"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.RMG.CardiacRehab.500Bldg"}
elseif ($workstation.Description -like "RMG-Card-500"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.RMG.Cardio.500Bldg"}
elseif ($workstation.Description -like "RMG-CardV-500"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.RMG.CardioV.500Bldg"}
elseif ($workstation.Description -like "EKG-500-Bsmt"){Add-ADPrincipalGroupMembership -identity ($workstation.name + "$") -memberof "SG.EKG.500Bldg"}}