Tally so far, Logitech = 6, Altec Lansing = 1, M-Audio = 1, Creative = 1, any others?
Without going elaborate with some sets seeing 300-400w for an output the sets by Logitech usually found under $100 generally work out for most. Just remember that the woofer will be the largest item on any 2 1/2, 4, 5.1, or 7.1 set you go with. With 70rms total that averages to about 10-12w per channel.