The TS-B2000 is just a TS-2000 without a front panel. I've got an RC-2000 which I use with my remoterig boxes and while it works, it's much harder to use than the standard TS-2000 front panel due to extensive use of menus. Very difficult to operate on HF - seems like any time I want to change anything, even the most basic things like VFOs or memories I have to piddle with the menus.
My recommendation to you, assuming you haven't yet purchased a TS-B2000, is to get a full TS-2000 and use the front panel remotely. You'll have to figure out some way to mount it, though (I've never had mine off, so I don't know what it would entail.)
73
Brad KB9BPF