Newbie Build Questions

Hey, excuse my 'Epic speak' but I'm a huge 'noob' at constructing gaming computers. Only once had I ever assembled computer parts and I really had no idea what I was doing, nevertheless I am here today with my 800$-100$ Build all set up; and I'd like to ask a few questions, and get some good advice...

Anyways, these are the specs of my current build:
EVGA GTX 660ti (2GB) 299$
i5-3570 229$ 229.99$
4x4Gb 240-Pin DDR3 75.99$
Western Digital 7200RPM SATA 6.0GB Hard Drive 99.99$
ASRock Z77 Extreme4-M 139.99$
CORSAIR Enthusiast Series 650W 119.99$
Rosewill BLACKHAWK Gaming Mid Tower Computer Case 99.99$

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Total Price after Rebates and Discounts: 985.99$

Basically my question to you "forum-go'ers", is it worth it? Can I cheapen the price without losing power? Keep in mind that I plan on dual 660ti SLI in the future, and maybe some other small additions but for now; could this setup play most games on high with few difficulties? I really do appreciate the help and guidance.

Thanks, Asher