Intel doesn't make a Granite Bay motherboard.

You're right, Intel does not make a Granite Bay motherboard. My mistake, sorry.

But I wouldn't get one of those anyway if I were you.

The Granite Bay series should never have been released anyway becasue they'll have a pretty short life span. By may Intel will present its Springdale/Canterwood chipsets who look MUCH more appealing than Granite Bay.

After those chipsets are presented, Granite Bay boads will already have become obsolete.
Springdale/Canterwood boards will also feature the new ICH5 southbridge chip which (among others) supports Serial ATA natively.

I would wait for those new boards if I were you. There are due not so long from now. Granite Bay boards really doesn't offer much advantages over i845 PE/GE (except AGP 8x) anyway AND they're very expensive.