Tower ordered, $10 rebate + free shipping..Yeah!

Ok doky on my way now...woot! Just ordered a COOLER MASTER HAF 912 RC-912-KKN1 Black SECC/ ABS Plastic ATX Mid Tower Computer Case from Newegg, Listed for $59.99 minus $10 mail in rebate=$49.99 with free shipping. Next item on the list....power supply, now viperman picked one out a CORSAIR Builder Series CX600 V2 600W ATX12V v2.3 80 PLUS Certified Active PFC Power Supply, this one was on sale on Sunday but I dont work on Sunday so missed his email. this was on sale on Sunday only. So this one might not be on sale any time soon, so may go with something different. Now I have a question, single rail or multi rail power supply? Opinions accepted. Also making sure that the power supply has 2 PCIx plugs also.....a big thanks to viperman for all his help, he suggested the tower I just ordered.

[(TKC)-o]T3[o]

I have moved this to the correct forum.

Connectors
1 x Main connector (24Pin)
1 x 8 Pin CPU
4 x Peripheral
6 x SATA
1 x Floppy
2 x PCI-E

and 1 rail is better then multirails. less fluctuation in the amperage