What I did (the last time, LOL):
partitioned as GPT (200MB EFI + 800GB OS X + 200 (well, 1980 or whatever) W7) and installed OS X.
from OS X I ran a copy of boot camp that I got from I don't know where that run's on hackintoshes (it doesn't ask to update the EFI). You may be able to skip this, but sometimes the W7 installer would growl at me if it saw the partition table as "pure GPT", so I think that the BootCamp partitioner not only partitions but updates/creates the protective MBR of GPT (in other words: it makes W7 think it's MBR, I think...).
Installed W7
Installed tonymac's Dr. Hurt RC5 pre 8 installer package.