http://pcpartpicker.com/part/intel-cpu-bx80646i54690
The i5-4690 hands down. It's $200 so actually cheaper than the slightly slower i5-4670. The i5-4690K is $30 more but requires a slightly better motherboard to overclock and frankly wouldn't make too much difference in gaming.
This MOTHERBOARD is $82 and may suit your needs:
http://pcpartpicker.com/part/asrock-motherboard-h97mpro4
Personally I'd recommend this one since I prefer ASUS due to pretty great reliability but the Asrock above may work just fine:
http://pcpartpicker.com/part/asus-motherboard-z97mplus
Other tips:
a) 2x4GB 1600MHz CAS9 DDR3
b) Windows 8.1 64-bit (and Start8)
c) NZXT 220 case (an example)
d) R9-270X, R9-280X or GTX970 (depending on budget for graphics card)
e) 450W up to 650W PSU depending on graphics card
f) DVD burner
g) 120GB SSD (about $60)
h) 1TB, 2TB or 3TB HDD (secondary storage for Steam games, downloads etc)
CHEERS.
If your budget for the graphics card is sub $200, then the R9-270X is great. There's one for as low as $155 after MIR which is an awesome value when you factor in you can get THREE GAMES with that:
http://pcpartpicker.com/part/msi-video-card-r9270xgaming2g
Games on the list I've recommended: Sniper Elite III (now supports Mantle), Tomb Raider, and Star Citizen
Note that some of the games may be dirt cheap on Steam so don't waste a free game on those.