Yep, grab a 670. It'll be a good upgrade, and will run much cooler and quieter.
(Also, don't bother with a 680, if it looks tempting - it's only 5% faster than a 670 (2-3% after both are overclocked), but it costs 25-30% more. Not worth it, especially when a 670 will max out basically any game at 1080p.)