The GTX 970 is a small reusable step up on the upgrade path. It probably is a little overkill for your current CPU/motherboard, I actually am running the GTX 970 in my x58 well overclocked system which will be replaced in the next month or so. I have most of the pieces for my new build up and running (barely) on a table. After I figure out this new UEFI BIOS and get everything working smoothly I will put everything into my Lian Li case that has the x58 currently.
The GTX 970 uses less power than previous cards and it has new forward looking HDMI 2.0 compatibility.