Altecs were the ones to get. Logitech was secondary. If you wanted top end speakers you'd go with some of the Creative Labs, JBL or Harman Kardon if you want to spend the money. As far as PC speakers go though - my 10+ year old Altec Lansing XA3051 is still going very strong.
I personally haven't used any of the KLIP speakers. Aside from the specs on what the speaker output and such may be, I really just want to know that they sound good. Have them crank it up in a store and see how it goes.