Thanks for the advice Loadswine, it is appreciated.
Unfortunately I want a better quality system and you do need Components to do it. It will be part of a fully upgraded sound system.
I did look into putting the Infinity's in, put decided that if I was going to do it, I would make the effort to get the best sound quality I can afford. The Infinity's look a good option for a straight speaker swap, but it still doesn't give the full sound possible for a set of components and a subwoofer, run on an amplified system.
I'm not to fussed about having to work hard, I'm just greatful for those links so at least I shouldn't miss anything!
Dash