You'll either get minimal responses, or tons, depending on how the stars align. Just so you know, this place dies other than business hours. I'm replying because you emphasize good sound, so your budget makes you an uber-noob and I thought I'd annoy you and everyone by giving some basic advice based on your good sound criterion.
I'd say you need to start with 3 speakers, L/C/R (left/center/right) and you might not feel the need to add anymore. If you want to add center later, be sure you get mains that have a matching center. You want a center - not just for movies, but it allows you to play with surround modes for 2 channel music (very useful) and there are many 3 channel SACDs where the original recording was 3 channel, if that's your thing.
I took a quick look at a place that sells inexpensive gear, just to get a feel for prices, and I came up with ~$600 for a L/C/R matching combo from a good quality manufacturer. I'm a sound quality guy, and that was the minimum I could accept for sound quality.
So I made your budget with just speakers (the mains were 300/pr
.) You could substitute a $300 sub for the center, but you're still at your budget without a receiver, and you really should have a center.
Whatever, you'll be doing yourself a favor by saving until you can double your budget comfortably.