I'm in the same boat. I'm looking for some decent speakers (sub £100 and 2.1 setup for space reasons) to replace the ones that have just died on me - well the sub unit anyway.
I'm not overly keen on Creative and the comments on the logitech were generally along the lines of 'very loud, boomy sub' (that will shake the house lol) and on some there's mention of interference that can be heard through the speakers.
So I think I'm going with these:
http://www.acoustic-energy.co.uk/Pro...ies/Aego_M.asp
Haven't read a negative thing about them (yet) but probably not the best for gaming.