This is the Tonga GPU AMD has been talking about for a while, and should effectively replace the 280X. While offering the same performance, the TDP is 60w less. At 4 hours of gaming a day over a 30 day month, that's a 7200w savings. For some places, that could approach $10.
190w isn't that bad considering the power of the card. I'm going to wait until I need a whole new system to upgrade again if i can help it. Heck, I'd love to have a whole new case as well, this Antec 1200 isn't necessary in an age of liquid cooling and shrinking TDPs.