The Italian made models are worth more than the Americans. The American models go anywhere from $150 used to $300 new. The Italians usually start around $400 and go up but that's considering the gun is in 90% condition and up. Having box, papers and spare mag raises that considerably regardless of condition but that's usually what's missing when people come across them in closets and drawers.
If you've got one foot in yesterday, and the other in tomorrow, than you're pissing on today.