I think Barnett MIGHT be able to take Lesnar. At the very least he'd be competitive in a fight with him. I really think he(Barnett) will beat Fedor in a couple of weeks. As far as UFC signed fighters go versus Lesnar. Shane Carwin with his wrestling pedigree, and power would have my money. However, I just don't see anyone really beating him while he's in current form.
I think a heavyweight to watch is Lashley. He has size, but he also has good skill. Plus he is working his way up, he wants to be the best and he is trying to prove he has the ability to be the best.
Lashley defintely has the physical attributes to be more than a contender someday. The skill set is not quite there, but as you said. He is working on it, and I'm sure we'll see him on a big ppv within the coming years.
This effen blows. I have tix for this too. http://sports.yahoo.com/mma/news;_y...o14?slug=ys-mmaweek072209&prov=yhoo&type=lgns