I have Altec Lansing now, and they are good. But I would say go for either Logitech or Klipsch. It's kind of off-topic, but my dad is running Klipsch 5.1 upstairs off a Marantz reciever. The sub is 1000 watts, and boy we shake the whole house down.
Nonetheless, it does go to show that Klipsch is good quality.