01-06-11: Goatwuss
I don't believe the RB1000 has adjustable VTA. If I decided to move forward with that arm, I would probably go with the shim-based approach. Once I get VTA roughed in for an arm/cartridge I don't usually mess with it too much, and I can buy R. Gandy's position that the increased rigidify is more important than more easily adjustable VTA.
While rigidity is important, having fixed VTA/SRA you just can't extract everything that's possible from cartridges with exotic line contact stylii.
Perhaps most of your records are the same thickness(?), but mine are all over the place.
IMO having fixed VTA is like having a camera with no adjustment for focus. YMMV.
I only adjust VTA/SRA to compensate for record thickness. It can be really surprising how much adjustment is required to maintain a static VTA over different records - which can be easily set/verified with the Phantom arm's micropoise level.