For the price difference i'd avoid water cooling unless you can get a 240 or even 360 rad. The cooling capacity doubles from 120 to 240 and triples from 120 to 360.
With a 120 rad you will see no worth while benefit from water cooling compared to a nice £20-40 cpu cooler. These will handle a quad at 3.6 easy.
http://www.scan.co.uk/Products/Arct...ce-Quiet-Intel-CPU-Cooler-775-939-AM2-AM2plus
http://www.scan.co.uk/Products/Xigm...pipe-LGA775-K8-AM2-Cpu-cooler-Quad-Core-Ready
As for water cooling, the reason i went water cooling is because it was a thing i have always wanted to do, and it is a great experience that i recommend to everyone. As with anything, the more you spend the better the outcome. Imo you should piece together a nice custom kit, witha mix of new and second hand parts. You should be able to get a real nice kit for about £100-120. Though I also recommend the swiftech compact systems, they are great to start with. The
Swiftech Apogee drive is a laing ddc pump at 10w which can be modded to a 18w really easily for some added power if you decide to add extra blocks to the loop. The copper base of the unit is the same as the apogee that retails for £35 I think.
This is a quick loop i've chucked together, You'll be able to save money on these forums and on ebay. My first watercooling loop, was also custom made by myself and you get a great sense of stisfaction that you've chosen each part yourself. Real easy to do, just have some common sense and you'll be fine.
EK-Supreme LT i7 - Acetal (775 & 1366) EK-Supreme LT i7 - Acetal (775 & 1366)
£32.99
(ex Tax: £28.69)
D-Tek DB-1 (aka DD-CPX1) D-Tek DB-1 (aka DD-CPX1)
Cost
£29.35
(ex Tax: £25.52)
XSPC RS240 Radiators XSPC RS240 Radiators
£31.99
(ex Tax: £27.82)
Yate Loon D12SM-12 120mm Case Fan - 3 Pin Yate Loon D12SM-12 120mm Case Fan - 3 Pin
£9.18
(ex Tax: £7.98)
Swiftech Mcres-Micro Swiftech Mcres-Micro
£14.67
(ex Tax: £12.76)
1/2" Red/UV Orange High Flex Hose 1/2" Red/UV Orange High Flex Hose
£9.16
(ex Tax: £7.97)
EK 1/2" ID fitting G1/4 EK 1/2" ID fitting G1/4
Cost
£6.64
(ex Tax: £5.77)
Total: £133.98
Just found some awesome deals on ebay.
Swiftech res £10 inc del.
D-tek fuzion one of thebest blocks available, if not the best for quad cpus. £20
Swiftech rad very good rad its supposed to be better than the xspc ect. £15
Tot: £45 add tubing, pump, few bits n bobs. And you've got a wicked setup for about £100.
http://cgi.ebay.co.uk/Swiftech-MCRe...286.c0.m14&_trkparms=66:2|65:13|39:1|240:1318
http://cgi.ebay.co.uk/swiftech-doub...286.c0.m14&_trkparms=66:2|65:13|39:1|240:1318
http://cgi.ebay.co.uk/D-Tek-Fuzion-...286.c0.m14&_trkparms=66:2|65:13|39:1|240:1318
Hope this helps
Ed