*Note: I did not select a case and an optical drive. It will depend on your personal preference because those two will affect the looks of your computer.
Also Leave around $150 for Case / and add a Blu-Ray Burner like Pioneer 15x or something. Wouldn't just getting the GTX Titan be cheaper and better then having the SLI?
For gaming only, just change the i7 to an i5. Nahh, just kidding for $2000 bucks budget I wouldn't cheap out and get an i5. The hyperthreading of i7 will work great on games like Battlefield Multiplayer. Anyway, I wouldn't suggest that you buy that build already. Let's wait until November when the new AMD Videocards are widely released. By then, I could build you a better PC.
This build includes everything you need and nothing you don't. I included two SSD's for a RAID0 setup which will reduce your boot and load times dramatically. The power supply is also enough if you choose to SLI later. The total comes in under your budget which leaves play room for you to change the case if you want. Should be quite a powerful build for gaming, have fun.
The Asus Z87-K motherboard you chose does not support SLI. You should change it to Z87-A which is a little more expensive.
Also Leave around $150 for Case / and add a Blu-Ray Burner like Pioneer 15x or something. Wouldn't just getting the GTX Titan be cheaper and better then having the SLI?
You can remove the SLI if you like. It's not very beneficial on 1080p monitors anyway. But still, get the Zotac GTX 780 AMP Edition. I personally have one and it's much cheaper and much faster than the Nvidia GTX Titan. However, I cannot guarantee its lifespan as I have only been using it for less than a year.