Im trying to build a rig end of this month.

Based on the Jayacom pricelist, I think im going for this rig.

Core i7 3770K 8MB 3.4 RM1010
D3 HyperX 1866 4Dimm 16GB RM445
240GB GT Sata3 RM799
P8Z77-V LGA1155 D3/ CrossFireX/ SLI/ GamingBoard RM649
GTX 660 Ti Direct CU II / DirectCU II “O ” 2GB DDR5 192Bit RM1160
ASUS Box Dvd+RW 22X RM57
CM690 II Advance Desktop Chasis RM370
23” LG LED monitor E2341V RM450
Logitech® Gaming S520 RM148
Z523 Logitech Speakers RM265
Backup power BK650-AS RM265
I don't know how to pick a power supply unit for this build.

It end up with the total price of 5600+.
Any suggestions what sort of stuff i should improve on and cut short off?
Budget is around 5.5k for me.

Both gaming and rendering, running alot of Sony Vegas stuff lately.

Overclock yes. SLI maybe no.
But then again, whats the price difference between SLI and non-sli.

Im not sure what kind of desktop chasis and cooling system to use if i overclock it.