If it hasn't been arsenal reblued -- and most of those don't have matching numbers -- you may be looking at a reasonably-priced shooter. (It may even be collectible.)
I've had a couple of Lugers and will keep one old beater/shooter, but there are too many hucksters selling "collectibles" in the market for my taste.
The price you cited is top-end for non-collectibles, but the starting price for collectibles.
(War trophy or not doesn't make that much difference -- unless you have written documentation to support its "trophy" status. And the import marks don't matter that much either, if it hasn't been reblued. Collectors don't like import marks, but will live with them if everything else is right.)
My shooter was one of the flood of guns imported from the ex-Communist block. All parts but the side plate matched, and it had been reblued. Amazingly accurate despite a badly pitted barrel. A real hassle to keep running, though, as something seems to go wrong every couple of months, when I shoot it regularly. And because Lugers were essentially hand-made guns, you just can't swap out parts -- they often take hand fitting by somebody who knows what he's doing. (And, because the parts are all numbered, swapping out numbered parts affects the collector's value.) If the gun has been reblued, it basically destroys its collector's value.
Buy it for a shooter, and hope its collectible.