Prices are sky-high right now, at least folks are ASKING sky-high prices. 450 would not put you in the outrageous spectrum especially if you are offering "hi-cap" magazines in the bargain.
It DOES sound like you overpaid back then. I got a new one for $450 in January 2011, a PT 99AF. But you might be able to recover now. Only one way to find out.
New Smith Airweights were going for slightly under $400 best price, before Newtown. If that's what you're thinking, sounds like a good trade for you, especially if someone wants a hi-cap 9mm.
I like the Taurus better than the Beretta also, much prefer the design with the frame-mounted decocking safety. My Taurus was a bit finicky though.