Im deciding whether to use polygons or bitmaps for my next game. i know bitmaps look nicer, but im no artist, and i think polygons are more precise. whats your input?

I imagine it would depend on exactly what kind of game you wanted to do. If you want to do an rpg style game, you would use bitmaps, but for something like your asteroids game ( nice job on that, btw ) you could get away with polygons.
Then again, it would probably be a good idea to use bitmaps just for the sake of the knowledge and experience you would gain. If you got a job doing games more than likely there would be an artist to take care of the bitmaps, so you probably shouldn''t worry about that.