Tell us some more about the instrument- color, body wood, does it have any upgrade options(such as flamed maple top, body binding, special neck finish, etc.). At first glance, I would say that $1,000 is a little high. It has been my experience that G&L resale value is poor. That's sad given the quality and performance of the instruments. I think one of the issues is low name recognition. Most people in my own area(Nashville, TN) do not know the G&L name.
Another thing that interests me is that I have seen older L-2500s(4 and 1 headstock) sell for more than more recent versions. I'm not sure why that is unless it is part of some "vintage" mythology that is out there.
Currently, there is a
beautiful L-2500 on the bay with butterscotch finish and a GOT "bird's eye" maple neck. That is definitely
not standard. In fact, the G&L website says that bird's eye fingerboards are available in fretted only(?). At any rate, the bass has about 4 hous remaining on the auction and the bid is only up to $600 or so.
To make my long story even longer, I would guess(sight unseen and without more info) that I would probably go no higher than about $850 on the instrument you mention unless I was really coveting it. I will tell you that I was able to buy an L-2500 fretless (2003 vintage by my guess) with a non-operative preamp for considerably less than the price you mention. This bass was restored to full functionality by replacing the LM-4250, so it turned out to be a good deal. It's the one at the bottom in this photo:
If you really like the one you are considering, the $1000 might be a fair price with the thought of keeping it for the long run. My point is that you might have a hard time recovering your money if you decide to sell it.
I hope I have confused things enough to be helpful.
