I have a 2000 MIM Jazz Bass that I want to upgrade. (not that it really needs it, but I just can't help myself) I'm going to do the series/parallel push/pull pot, and shielding. I want to change the bridge and make it thru-body. Are there any other choices beside a $40 Fender Deluxe or a $200 top end bridge? Is mass all that important for thru-body string mounting? What about replacing the pups? I don't play out, just messing around with friends on weekends. Thanx.