Depends...
looking at your signature probably starting at £300.00 for a basic one (CPU kit + 295x2 block + extra radiator and fittings), a good one would be at least £400+
My setup is already 30% more expensive than my initial plan

You will need two more fans for the XSPC kit I think?I think this would be a good start for a Corsair 540 plus the liquid you are going to use as coolant.
YOUR BASKET
1 x XSPC RayStorm D5 Photon AX240 WaterCooling Kit £234.95
1 x Aqua Computer Kryographics Vesuvius 295 X2 Acrylic Edition £119.99
1 x OcUK Tech Labs Radiator Bundle - Hardware Labs Black ICE SR1 360 + 3x Silverstone SST-FQ121 Watercooling Optimised Fans £69.95
4 x XSPC G1/4" to 7/16" ID, 5/8" OD Compression Fitting (Black Chrome) £3.49 (£13.96)
Total : £438.85
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You will need two more fans for the XSPC kit I think?