I would try the L2500 before buying, but would definitely take that over a JB. I personally found the feel and tone of my old L2500 lacking in comparison to the L2000s I've had- I'm not a 5-string kinda guy but I would definitely want a longer scale for a 5 string if I did need one again. I think the scale was really the root of all my issues with the L2500. I would also second the SB-2 suggestion (it really is noticeably different than your average P-bass to my ears)- that and the L2000 are really the cream of the G&L crop in my opinion. Also +1 to the single-coil option on the L2000/L2500- I've done it myself on all the L-series basses I've had, and I REALLY love the singe coil tones!