Well, I am thrifty so take that into account, but I'd go with the used one if it looks like it has been well taken care of. You will save $2500 cash and that will buy pretty much all the farkels you can think of with plenty of money still left over. As for the $1000 in accessories you'd theoretically miss out on, how many of those would you get if you actually had to pay for them?
Either way is not a bad deal though - I guess it all boils down to if you want new or not.
"If you don't peer over the edge now and then, how do you know where it is?" The venerable Mr. Cob