I have a very early USA Lakland Glaub that is probably the best built, best feeling bass I've ever had my mitts on. I also had a very early Metro JJ, also great. Also had several USA L2500s and now favor my USA JB-5 and Kiloton 5. They're all great, but different.
Aside from the feel and fit and finish, here's an idea---see if you can try the Sadowsky outboard pre on your existing basses. It really kinda does turn any bass into a Sadowsky (give or take of course). I used mine on my L2500 a ton, totally smoothed it out, transformed it.