The TRB models are fantastic, I used to have a 1004 and 1005 which were my main basses for some time.
You won't miss the through body stringing imho, these basses are very resonant with great attack and sustain. I believe the standard Hi-mass bridge is solid brass.
The Yamaha Alnico humbuckers are famously awesome, and although there's no passive bypass on the preamp, it sounds great and I never missed not having a passive option. You could always change the preamp if required.
The TRB's can be pretty weighty, so that's something to consider.
The 1000 series are incredible instruments for the money, and clearly any of the Japanese models are a step up in quality of materials, construction and finish.