Old Griz:
You've probably got a fine harem of guns, all begging to be shot more. Sure the new ones are nice, but you can live without them.
If the previous two sentences don't ring true for the Diamondback, you really should go back and do something about it though. You can get a SIG anytime, but good Diamondbacks aren't getting any more common.
(side note: We went to a huge street rod show a few weeks back and after seeing it I firmly believe that there are more '57 Chevys today than there were in 1957.)