Just go for a 4690k. There's not much in it between that and the 6600k and it will still last you for a good few years. Even better, keep checking our Members Market and pick up a bargain deal.
I know there isn't much difference but the 6600k with that second bundle doesn't cost much more than the 4690k setup and I will be keeping this for at least 4/5 years so it will be a bit more future proofed than DC.
Will keep an eye on the MM for any bargains though.