His (op) question should really be read: go all out on GPU and get cheap CPU now and upgrade it later, or get cheap GPU best CPU nwo and upgrade GPU later?
Imo that depends if budget is big enough (or can be for upgrade) to get 980 GTX then i would get best CPU now and wait about a year for nvidia to release 980 gtx somewhere for next Christmas.
If there is no to get 980 GTX i would go now for 980gt plus best motherboard, then upgrade ram and cpu later.