Tough call, I've wanted an AR since I was in the sixth grade or so, 17-18 years later I finally bought one, have had it for almost two years. I'm not normally for ever selling a firearm, if I had two then I'd sell my second one. I don't foresee any completely restrictive legislation passing. However I don't see prices settling back down completely to pre dec 2011 prices again on both ammo and EBRs so selling now for a nice profit could help offset future ammo prices and EBR prices.
I hope I'm wrong about the prices never being what they were, look at gas, we are now happy it's just above $3 because it had been between $4-5, retailers aren't stupid.