I've just taken the plunge and ordered this lot:
1 x 280mm Koolance HF radiator (30mm depth)
XSPC Raystorm CPU waterblock
3.3 metre 3/8"ID 1/2"OD tubing - About £120
2 x Akasa Viper 140mm
1 x Coolermaster 200mm blue - About £35
Already got a Liang DDC + XSPC Bay Res + Fittings.
Thats £150 - which ain't too bad taking into account I should be able to rake back half by selling my H100
Only problem I can forsee is where the ATX power plugs in on the motherboard getting in the way - its probably gunna be a tight squeeze but should fit /fingers crossed