Receivers: Can't go wrong with Onkyo, Yamaha, Pioneer, Denon
Speakers: Audiogon.com has great deals on used speakers, where you can get quality for cheap. Used speakers are nothing to be afraid of. If you don't like that, you can get some quality Klipsch and Polk towers/centers/surrounds on places like Newegg.com for cheap.
Sub: Dayton subs are the best you can do on a budget for a new sub if you aren't going to build your own.
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