Well the title says it all so humor me. I can get a brand new entry level iMac with the 3.06 i3 for about $950 in store. The hard drive size is a non-issue and neither is the slightly slower processor. What concerns me is the HD4670. I know that the iMacs have a special daughterboard for the GPU and I was wondering if somehow I managed to get my hands on a HD5670 daughterboard then would I be able to stick it in and it would work? Personally I don't see why not as I'm assuming the 21.5 3.06, 21.5 3.2 and the 27 3.2 essentially have the same components sans the HDD/processor speeds.