Basically, any motherboard that supports and can properly power a given CPU at a given clock speed will perform just about the same as any other board that supports the aforementioned.
So, a $90 G1 sniper H97 will run a 4790K at stock and a GTX 970 at stock just as well as a $400 Maximus VII extreme. The differences in motherboards are power delivery, feature sets, connectivity, etc.
You'll get a bare bones board if you go with a B85 board ($65) with no extra SATA/USB/etc controllers or ports except the bare minimum the chipset provides, and you won't be able to do SLI. A midrange board like a Z97Extreme6 ($160) gives you more controllers, more connectivity, overclocking options.
The board you have now has either 4+2 or 6 phase power on it. That's good enough for a half decent overclock on a K SKU i5 or i7. Other than that it'll play BF4 @X resolution at X settings just the same as a $400 board will.
Hope that answers your question.