Sell it. Unless you're pro and have to have spare body, or you have very specific need that this body can fulfill (articulating LCD?).
I'm not a pro, but after upgrading to Mk II, was hanging to my 30D for way too long, and eventually realized I haven't touched it in 2 years. Sold at that point and got only $180, but that's better than nothing.
I did build secondary and thirtiary system eventually, but for completely different reasons/needs. Sony SLT for taking pics of kids through the LCD, as I have more flexibility to take pics using LCD, and also defend cameras from babies' prying fingers
SLT allows phase detect (fast focus) through Live View.
Admittedly, my need was very niche, but most people like to have small portable camera, so if you do too, you can use money towards G15, or Fuji X10/20, Panasonic LX7, maybe Sony RX100, or Olympus XZ2. I tried first three, and liked X10 best.