Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
If you plan to use that motherboard with a 3570 it will have to be flashed with the F11 bios, i'd go with a decent heatsink and fan over a cheapish closed loop system any day but thats just me.
I wouldnt expect a £50 sealed water cooler to be up to much to be honest i'd rather get a £30 air cooler that performs better.
http://forums.overclockers.co.uk/showthread.php?t=18348208