MSRP on that pistol is $1129. can't honestly say whether it's a good trade or not, but i'm not sure i could make that trade myself.
a good trade is when both parties leave happy. and i sense a bit of reluctance on your part. might be better to walk away from this trade.
about them only making 250 of them a year, i have heard that before as well, and that may only be internet rumor, but i haven't seen any evidence to support that statement. so it could be true, but it could be simply rumor to jack up the price a bit and help be in a better trading position. maybe someone else can either verify or dispell that claim about them only making 250 of them a year.