If you are not interested in Crossfire/Sli, then go with the 970 board.
The Phenom II X4 will definitely give you a better gaming experience and would be my recommendation. It will definitely last you until Piledriver gets here and the prices have settled. You could even overclock (get a good cpu cooler, not the stock fan) the X4 to get even more life out of it just in case you want to wait a little longer before getting a Piledriver.
Edit: Sorry, forgot you mentioned no overclocking.