Overclocking and SLI'ing 2 Video Card question...

hey guys. waiting until my parts get in the mail tomorrow, and looking for some advice.
my computer will be for mostly gaming, surfing the internet, etc.

Want to know if my system can handle both of them being overclocked and SLI'd. Also want to know if there would be any point to overclocking them and SLI'ing them since main purpose would be as such, and would just be massive overkill. Dont mind waiting until wouldn't be extreme overkill and new products and such have come out to overclock them. Do plan on SLI'ing though i think.


Build:

Video Card: (Using 2 of them)
EVGA 896-P3-1260-AR GeForce GTX 260 896MB 448-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card

RAM:
OCZ 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Triple Channel Kit Desktop Memory Model OCZ3X1333LV6GK

Mother Board:
ASUS P6T LGA 1366 Intel X58 ATX Intel Motherboard

Harddrive:
Western Digital Caviar Black WD6401AALS 640GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM

Processor:
Intel Core i7 920 Nehalem 2.66GHz LGA 1366 130W Quad-Core Processor Model BX80601920

Power Supply:
CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply




Appreciate it guys. Most games i play will be like Diablo2, WoW possible, Crysis2, CoD, etc... thanks.