I was able to speak with someone at tech support for SRAM and we had a good conversation. Once he understood what kind of riding I do, he suggested that I go with X9 derailleurs and either X9 or even X0 shifters due to the amount of mileage I will put on my drive-train. Apparently X0 shifters are for racing so I don't know that I need to go that far, but I probably will go the X9 shifter route should I settle on SRAM over XT.

So far I've only worked with SRAM shifters on a trainer at the LBS. I want to do a real test ride outside before I make my final decision. Everyone I have spoken with so far has agreed that they are less finicky than XT and easier to adjust/keep adjusted and that means a lot. I really have to take my hands into consideration though - so that test ride is vital for my decision. It isn't a cheap change if I pick something that I won't like...