So I've been playing for about 4 1/2 year, and I have a Gibson SG Standard which is simply amazing, just restrung and adjusted, I feel like it could play anything. I also have a Martin Acoustic/Electric which was just repaired (it dried out pretty bad, but Martin paid for it, go figure).

So my "new member" question would be this. Can anybody give me a challenge to learn some new songs and maybe some theory? I always ask people, "what song should I learn?" and I never get a good song. Any suggestions?
What kind of music do you like? Depending on your answer I could give you some drastically different songs to learn.