The C/K Suburbans (1992-1999) are tough trucks. You get all of the same benefits of the C/K pickups...reliable engines, decent transmissions, and a well thought out design. 1996-1999 had Vortec engines with slightly improved fuel economy and power over the TBI engines. 1995 brought a greatly improved interior. The engine options are the 350, 454 (2500), and I think the 6.5 diesel (2500). Big openings in the front bumper should mean it has a diesel.
Problems with the C/K trucks: electronics and switchgear. I have seen plenty of these with HVAC, radio, and power feature issues. You could get this generation of Suburban with crank windows, manual locks, and a "W/T" interior. Being in NJ, rust would be a major consideration but that's going to apply to any SUV up there.
I'm less familiar with the GMT800 ones (2000-2006). The engines (5.3, 6.0, and 8.1) are pretty reliable. They have the same cold start knock issues as the pickups, but there's no evidence that CSK shortens the life of the engine. The last 6.0 2500 GMT800 Suburban I was in was SLOW. I don't know if it just came with a bad gear ratio or if something was wrong with it, but it did not have a lot of go. An 8.1 would have a lot more grunt, but the fuel economy is going to be awful. Again, electronics and switchgear are the weak point. IIRC, smoking inside can damage the electronic 4WD controls.
I think either the C/K Burbans or GMT800 Burbans can last a long time with decent care. They should be capable of 250K-300K miles without much work.