Should I purchase an extended warranty for my D3 at Crutchfield? They run $80 for an extra 2 years (not including manufacture warranty) or $130 for an extra four years?

It is really up to you. But be warned that the warranty does not cover shipping costs back and to the factory. If you dont have the warranty, they charge a 200 general fix fee.

Since you are getting it from CF, you get a 1 year warranty. I think so that should good enough.