Nothing is "wrong" with what I have now, I love the bike and it's a very fast bike to boot, but I'm looking for a few things,
1. I would like to have at least two bikes because you never know when something could happen and all of the sudden you have no bike.
2. A full carbon frame would be nice, not so much for the lesser weight but because I'm a decent sized guy and I'm a bit worried about flex with the aluminum.
3. The dura-ace upgrade is a valid point, occasionally I will have it shift on me out of nowhere, mostly on fast uphill climbs. I have no idea why this happens, though I think it's because when I shift down for the hill the chain is getting caught somewhere and then suddenly jerks into place. I've checked this out myself and taken in to my favorite LBS and they couldn't find anything, so who knows. And dura-ace comes standard on the bikes I'm looking at so why not.
So those are my reasons, some may find them valid, others may not.