I play an Ibanez SR 5-string, and love the meaty sound like Dave Hope of Kansas got. However, I have back trouble, and need a lighter-weight bass. Don't want to revert to a 4-string, either. I want to buy a short-scale 4-string with active pickups, replace the nut & bridge, and make it a 5-string. (I play with a pick, so I don't need as much string separation.) I want to keep the meaty-sound. And I don't want to spend a lot of money. Ideas on an inexpensive lightweight 4-string? Or ideas from anyone else who has tried to do this?