Does anyone know of a way to do a PowerShell ifmember?

I'm basically going through each users home directory which the folder name is equal to the users AD name.  I want to be able to see which of the 4 groups the users is member of then do something.

Quota 1gb
Quota 2gb
Quota 3gb
Quota 4gb

$userdata = "H:\homedirs"
$groupprefix = "Quota"

foreach ($item in Get-ChildItem $userdata -Name){
  
### This is where I would see the ifmember thing, then run the Windows 2003 quota command line to set the quota.  I did come up with this line, just doesn't seem like the right way here.


Get-QADMemberOf $item | Select-Object Name | Where-Object {$_.Name -match $groupprefix} | `
        dirquota quota add /path:"$userdata\$item" /sourcetemplate:$groupprefix


Any ideas or advice to this?