Help with first time build

650 would do you fine for SLI 460s. The PSU you've selected is way overkill; it could handle SLI 580s. Wait, actually, after seeing that low price I think it would possibly die if you loaded it up.
I like the CPU, RAM and HDD (not much variation there), and the case is purely your style preference.
 



The gigabyte PCI slots are (x16, x8, x4)
And the ASrock are (x8/x8, x4)
Is that a big deal?
 


Thanks! I think i will go with the Antec.
 
Actually that isn't even a good deal yet, if you don't could MIRs this is probably the best deal you can get.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817194093&Tpk=Lepa%20850

The gigabyte states 16x/8x/4x but when you're running Crossfire, you'll run at 8x.8x the same as the Asrock. Also, it isn't a big deal since even if the Gigabyte did run 16x/8x it would only be a few percent difference. I just suggest the Asrock because you save money.