-Intel Core i5 3570K (A good processor for gaming)
-Nvidia GeForce GTX 670 SLI (This is cheaper than a GTX 690/Titan and if I'm not mistaken is more powerful than a single 690/Titan)
-16GB Corsair XMS RAM (Quite a decent RAM brand, 16GB is enough for a good PC)
-Corsair AX850 Gold PSU (To power everything you have)
-ASUS P8Z77-V Deluxe (A good mobo for a good PC)
-1TB Western Digital Blue HDD (I'm not too sure exactly what do they offer)
Throw all of them into a Cooler Master HAF 932 case.
*All of these are just my opinion, I'm also pretty sure I left out some stuff but some parts I mentioned may be worth considering.