I take exeption to avoiding the 6.2 and 6.5L diesels. While not near as strong as the PSD or Cummins, With a little research and proper build up/maintance, my 6.2L has been dead nuts reliable. Main issues are poor fuel filtration, and guys thinking they can flogged the crap out of them like a cummins and not have it break. When I had my fresh 6.2L built for my truck, I had ARP head studs, ballanced bottem end, main stud girdle, and Mahle pistons that are made for turbo use, but also lessing cylinder wall scuffing. I can find parts at most autoparts store when I am on the road, cheap to fix and I get a solid 23-24mpg running light on the highway with the cruise on. The main issues on the 6.5L were the electronics and those can be dealt with effectivly. If you want a 6.5L suburban, check out the diesel page and other other GM diesel forums. Also you willl want the one issues of Max Torque Magazine as it shows how to build a 6.5L td powered suburban towing rig that can hang with a second gen cummins or first gen Powerstroke diesel without overheating and blowing up. Now the old 5.7L olds v8 diesels are quite a boat anchor, but most are long gone now and they were only avaible in the 1/2 ton trucks. You can actulay get a 6.5L block from GEP now that has all of the weaknesses fixed now. The block and heads are cast by Naviastar now, no longer have the cracking issues they were once prone to. The HP is turned up now as the Military needed the extra HP for the up armored hummers in Iraq but also needed the engine to last. I prefer the older diesels that have no electronics on them, GM 6.2L or 6.5L, Ford 6.9, 7.3 idi non turbo, and the 12v cummins. Let us know what ya get. Mike