A rasa kit will perform better than the
corsair and antec.
Cool it/ Aestek makes the all in coolers for those companies.
Keep in mind water cooling isnt cheap.
It will cost you 200 plus for a good set up
here is a water cooling guide I made
http://hardforum.com/showthread.php?t=1605565
Water cooling case suggestions
CASE LABS
MH10 -holds 360 rads
TH10 4 480 rads put 6 480 rad in if you want to
STH10 -480 rads
Cooler Master Cases
HAF932- 360 rad top
HAFX- 360 rad top
ATCS 840- 360 rad top rad on the HDD cages
COSMOS II- 360 rad top, or 480 top modification required...
Overclock settings I used on the 680
1.025 volts
+100 gpu off set
+500 memory off set
+132 power set
2cd run oc settings
1.115 volts
+150 gpu off set
+510 memory off set
+132 power set
3rd/4 run Oc settings
1.125v
+175 gpu off set
+515 memory off set
132 power set