Intel and MSI both offer EFI support desktop motherboards, I am running the Intel DP55KG motherboard, this is also the only system that I have been able to install OS on GPT
Also, you should have no problems installing Windows 7 on GPT. You must convert the HDD to GPT during windows installation and you must move forward without creating a partition, i.e. unallocated partition.
To install Windows 7 on GPT is simple; whiloe installing from windows 7 DVD, and you get to the segment that you can create or delete partitions press "shift+F10" this will open a command prompt and you can use diskpart to convert to GPT