Suburbans are just all around great TVs for more applications (not all).
I bought an '04 LT 2500 w/6.0L (passed on an identical one with the 8.1L still don't know if that was a mistake or not).
Love this truck. It's solid and is a real workhorse. The 6.0L is an exceptional engine. I would strongly suggest to anyone, even those that don't have Suburbans, to make sure you change the driveline fluids, particularly if you think they had not been changed. As the vehicles break in, some degree of metal wears and those particles get suspended in the fluids and captured on the magnets. I put in Amsoil across the driveline. Also, not sure what filter goes with the 8.1L, but GM did make a UPF-44 that has far better filtering than the standard PF-44 that mine came with. After the first 2000 miles of breaking in with conventional oil, I changed the oil to syn and installed the UPF-44 filters.
On the part of getting 200k, if I got that high, and the body and frame were still in great shape, I would then consider the Duramax/Allison combo that is done by a few shops around the country.
Computers manufactured by companies such as IBM, Compaq and millions of others are by far the most popular with about 70 million machines in use worldwide. Macintosh fans note that cockroaches are far more numerous than humans and that numbers alone do not denote a higher life form. -NY Times 11/91