I'm talking to a guy willing to sell me his Mesa 20/20 for $595 (and shipping, I assume though that hasn't been mentioned yet). I'm really into the power amp but it seems like prices for this power amp are all over the place. I tried talking to a guy selling one for $300 but he never responded to my emails. I've seen some for sale for up to $1000. I can't figure out what a good used market value for these amps is. So I'm forwarding the question to you. Is $595 for a chrome face Mesa 20/20 worth it?