I want to change the sound sytem in my 97 Blazer - do anybody have any suggestions on what I can do.

I would start by changing the head unit, then prolly the front and rear speakers, then maybe some subs, not sure how much you're wanting to upgrade. As far as brands go, I can't recommend because everyone likes different things

I personally prefer Pioneer...it is good quality for a fair price

pioneer, alpine, or eclipse deck. infinity, focal, rainbow, mb quart, seas, or CDT speakers. JL, Reonant engineering, Alpine, kicker, mtx, or infinity subs. orion, jl, elemental designs, or kicker amp.

There, i gave you some excellent suggestions