I think I am starting to make a decision.

Fronts: Pair Millennia M22ti Bookshelves
Center: VP100 Center
Surrounds: Pair QS4 Surrounds
Sub: Hsu STF1? I looked into this a little. So it's a good choice for my size room? The EP350 is probably too much unneeded power, right?
Amplifier: ? No clue, I don't know how these work, they have to have something to do with the watts right? I can check with the companies listed, but I'm not sure what I'm looking for. With the products listed above, what would be the best amplifier?