i5 3750 still g2g ?

or time to upgrade to i7 4xxx ?

Gonna go for the GTX 1080 when it comes out, don't want the CPU to be a bottle neck

You won't be bottlenecked.

You're G2G

Is it K version or non K version? If K version, OC it if you haven't already. Might give you the boost you are looking for.

K, I've overclocked at 4.4

Your good