Actually, you don't need to go to the 780Ti for some really good performance. You can save some by going to a GTX 770 card. I am running a GTX 680 and can pretty much run anything on Ultra with no issues. The 770 is pretty much a 680 on steroids. It has a faster Turbo for one thing. The upside is that it is cheaper than the 680. As for Intel, the i5 4670k is a good choice on a Z87 board as that will give you overclocking abilities, should you want to do that. With a $1700 to $1800 budget, you can put together a kick ass machine. You also may want to consider a Seasonic Full Modular PSU. They are High quality at a good price. Full modualr is handy for wire / cable management as you only use the cables you need and don't have a bunch of extras in the way. The object is to keep it as clean as possible in there for good air flow.