ive had a bunch of w bodies back to 88 when they redesigned and they were defiantly worse, as far as the body. i put an untold amount of door handles struts wheel bearings, etc. the rear discs on the early ones were terrible, fuel pumps and those are hard to get to. the newer ones have really come a long way, real good handles hinges, the brakes are way better. and i havent had to do a fuel pump in a while but if i do the car has a trunk access panel.
all you have to do though is work on some other brands a few times and it makes you really appreciate what you have. my father in law has a 05 ram quad hemi, that i unfortunately have to work on. the short story is they have poor engineering that lead to a $800 fuse box swap and no relief for that it will just happen again in 6 more years, the wheel bearings go with out warning and the wheels fall off the truck as your driving. and these are know and popular problems yet i still see that configuration on the newer trucks.
a guy at work has a toyota and everything on it is very expensive, i drive a ford at work dont even get me started on that pos.
so any way i think youll be fine with what you got.
1998 Bonneville SSE
2007 Monte Carlo LT-KYB, Clarion, Polk audio, Kicker
1999 Yukon SLE-KYB, Air lift, Reese dual-cam, Tekonsha
1987 Firebird-355/th400-nothing stock