i would recomend against a kit and instead buy each piece seperately. since i dont know your system, something like this maybe
http://www.chilledpc.co.uk/shop/prod...oducts_id=1079 - 33
http://www.chilledpc.co.uk/shop/prod...oducts_id=1000 - 33
http://www.chilledpc.co.uk/shop/prod...roducts_id=966 - 4.5
http://www.chilledpc.co.uk/shop/prod...roducts_id=421 -36
http://www.chilledpc.co.uk/shop/prod...roducts_id=659 - 20.4
http://www.chilledpc.co.uk/shop/prod...products_id=47 .82 x 6 (feet) = 4.6
http://www.chilledpc.co.uk/shop/prod...roducts_id=382 - 4.5
fan = your choice, probably something with higher RPMs but up to you.
this comes out to around 136 pounds, which is over budget :( it is a much higher quality kit then anything else though, and i highly recommend it. you could probably get a bigger radiator, but it is all up to you and how much you want to spend. water cooling is not cheap....
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now i remember