hey I'm after a decent set of speakers. I'm willing to: 1) stretch budget a bit, preferably lower the better though 2) don't mind going second hand via the forum's classifields I want to use them as: 1) plug into my PC/HTPC to get the music going from them 2) plug into my TV to blast some music 3) airplay from my iphone etc. Any suggestions? Do I need an amp? What does that do? how does it work? I'm certain I won't get a good surround sound in budget (lol) but i'd be satisifed with a 2 speaker combo which can go pretty loud for a party and still allow me to appreciate music better than my laptop/TV speakers and work with a projector/TV.