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Audiophiles may like 80's retro hugeass speakers, but for regular home use you don't need to spend a lot of money. Micca is a good brand that has some quality speakers for around $80 for a pair.
Logitech make some pretty good speakers too. Logitech Z-623 speakers + subwoofer are very good quality-wise, and if you want surround sound, there Logitech Z-906.