lagevogel

For the RAM, generally just go for the cheapest set in the color you like from a good supplier.
There isn't a huge difference in mhz and CAS, unless you're doing memory intensive stuff.
I usually aim for 1866, CAS 9.
 
Go with a big name GPU, you'll get better warranty coverage. I'm a fan of EVGA.
MSI, Asus, etc are all good as well. It's best to watch and read reviews of each card you like the look and price of, and go from there.
Nothing's more powerful than researching these things yourself.

@lagevogel
 
Depending on where you are from, EVGA warranty might not be the greatest.  I know it isn't in Asia that's why I got the Gigabyte G1 edition (which IMHO is the best option anyway )
 
The rest of the build looks decent.  You can save on RAM by going 8GB first, and if you need more, get another 8GB in the future.  8GB is plenty for games if you don't run 101 tabs on your browsers
      An i5 will never outperform an i7 for gaming.  The only time this happens is if games don't utilize HT properly, and in many games you can turn HT off with game settings and effectively have a i5.  If you plan to ONLY game, the i5 is a better cheaper choice.   If you plan to do things like stream, encode, edit, maybe some animation etc etc then the i7 is the better choice.  i5 saves you quite a bit of cash too.

If your using it for only gaming then get an i5-4690k, it actually outperforms the i7 in gaming
Also you don't really need 16gb of ram, 8 is fine
Use the money you save to get a liquid cooler