Gordita,
I've also heard that that Logitech Z-340's are quite good. If you want to get in for much less than the $50, you should take a look at the Altec ACS300's. They normally sell for about $39, but I picked up a set for $9 after rebate. They're a great three-speaker set. The sub has lots of suds and the satellites are very clear. You can "test drive" them at most Best Buys...
Good Luck,
KB