Replying to Car Audio

So heres the deal, I made a post the other day about replacing the headliner in my newly purchased 86 chevy G van.  Its in great condition, been garage stored and only has 85000 miles on it.  The headliner is sagging badly.  I plan to remove the seats from it to make it easy to work in, remove the headliner, install a new cd player and audio system and replace the headliner.  I dont know shit about car audio.  I dont need a ghetto blaster but I want it to sound real good when I turn it up.  What type of audio system should I be looking at if I want something that is affordable and wont drain the battery on the van in 5 minutes but still big pimpin?