I wouldn't expect more RAM than 4Gig on any new iMac. They use what could be described as mobile on the desktop technology and most notebooks are limited to 4Gig RAM... (Windows 32bit is limited to 4G too)
Isn't Windows 32-bit limited to 3GB? The MacBook Pro has an option of 8GB.
This is sweet after the refresh I will buy the top refurbs or clearance depending on their price.