Heh. Sounds like we have the same problem. ( see this thread:
http://www.bikeforums.net/showthread.php?t=284205 )
I am down to the Specialized Hardrock or te Marin Bolinas Ridge. But I'm also going to check-out the Gary Fishers. I have ridden an Opie before, and though I am looking for an XC bike, I think the low standover height will be good for my short legs. And the bombproof frame will be good for surviving my 300 lb weight. I think a few more pounds of frame don't make much difference when you have that much rider weight.