Depends what you are asking really. You can trim off quite a lot of money and not loose yourself much/any performance.
What resolution are you aiming to play at? If it's just 1080P (or lower), an $800 graphics card budget is massive overkill.
i7 to i5 (no difference in gaming really)
Bin the H100i. It's actually very good performance but it's expensive and noisey. Swap in the Noctua NH-D14 or Phanteks PH-TC14.
Change motherboard, I wouldn't chop too much off the price but if you want to go SLI then go with a full ATX imo, unless you are trying to make a compact build, and go with a Z77 chipset, no reason not to.
Half your ram budget, 8Gb is fine. If you don't need 16 for something in particular, don't bother.
Get a cheaper SSD. You can pick up a Samsung 840 Pro 128Gb for $130.
Get a cheaper PSU. 750W is enough, though 850W is fine for a bit of headroom. This is a hell of a lot cheaper- http://www.newegg.com/Product/Product.aspx?Item=N82E168...