The frame is probably worth about 1250+ on its own with the long barrel (not common around here) and scope being a bonus. You can swap another standard barrel (basically quick change) on it and shoot 50ae. 50ae even shares the same bolt with the .44 caliber, just need the barrel and mag. Or you can get a .357 barrel, smaller bolt, and mag and enjoy shooting a Deagle for $0.50 a shot.
I got a smokin deal on my gold .357, but I seem to remember seeing a couple nice, used, standard black finish examples range from 1700-1900. $2500 typically if NIB from a dealer.
Cheers