I really like the 2001 to 2006 models. Not much to bitch about and they reasonably easy to work on. I have an 04 Yukon XL Denali, which means the 6.0 and full time all wheel drive, both of which hurt mileage. Not a big deal to me, as I just don't drive it often. I do like the extra power of the 6.0. Some think it is the same power as the 5.3..... it isn't; I have driven it back to back with my son's 5.3 two wheel drive Suburban. It isn't a HUGE difference, but definitely noticeable.
I just pulled the trans in my son's 07 and had it rebuilt. Trans wasn't slipping but the converter was worn out; not locking up. Also, needed a rear main seal in the engine, so it made NO sense to pull it to replace the converter and rear main, and put it back in.
Had 255,000 miles on it, and my transmission guy said it had never been apart!!!!
If you can find an 01 - 2006 model with 5.3 and two wheel drive with fairly low mileage, and little to no rust, that would be a great starting point. Expect to spend some money on deferred maintenance.
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