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By an Amazon.com customer
Polk Audio Monitor 60 2-Way Floorstanding Speaker (Single, Black)Polk Audio Monitor 60 2-Way Floorstanding Speaker (Single, Black)
Buy new: $178.55
If you can, step up to the 70... if these are too much for you, step down to the 50. I've got mine bi-wired to the A and B channels on my receiver, and the sound is nicely divided among the drivers and those smooth-as-angel-skin silk-dome tweeters. Make sure you put two in the cart!
Polk Audio CSi3 Center Channel Speaker (Single, Black)Polk Audio CSi3 Center Channel Speaker (Single, Black)
Buy new: $119.99
You've heard it, and it's true... the center-channel is extremely important. For that reason, I've chosen the CSi3, which is actually a step up from the center that matches the rest of the speakers.
Polk Audio PSW10 10-Inch Monitor Series Powered Subwoofer (Single, Black)Polk Audio PSW10 10-Inch Monitor Series Powered Subwoofer (Single, Black)
Buy new: $126.52 / Used from: $100.00
Wire it passively in-line to the monitor 60s, from the B-channel running to each of those speakers. It'll cover the frequency-ground that the 60s simply can't dip into.
Polk Audio Monitor Series PSW12 12-Inch Powered Subwoofer (Single, Black)Polk Audio Monitor Series PSW12 12-Inch Powered Subwoofer (Single, Black)
This is the active sub for the system. Read the reviews, they're everywhere. Buy it, be amazed.
Polk Audio Monitor 30 2-Way Bookshelf Speakers (Pair, Black)Polk Audio Monitor 30 2-Way Bookshelf Speakers (Pair, Black)
Buy used from: $116.85
The rears are where you can skimp a bit. I'm actually running a pair of older JBL500s, but these would work well too. If you really want to go all-out, check out some of the remaining polk R50s that are floating about. For about the same price as these 30s, you could have another set of towers as your rears. I may be doing just this some time soon ;)
Yamaha RX-V559BL 6.1 Channel Digital Home Theater Receiver - BlackYamaha RX-V559BL 6.1 Channel Digital Home Theater Receiver - Black
Buy new: $279.95 / Used from: $129.12
This is my receiver, but anything from the Yamaha RX-line will do. If you can shell out the extra clams, then do it, because even though this drives the Monitors like a pro, it barely approaches half of their power-handling capabilities.