You've said it yourself: put the SV-1b back in its case, because it's skewing your decisions, unless you commit to a larger case. If you don't, you risk saying to yourself six months from now, "Why did I let this push me around?".
I think ATN8 is going to be too small and fiddly (it may prove difficult to use in practice), and I would suggest separating attenuversion and mixing in your mind (but not necessarily in what you purchase, just don't make the combo a priority). Nearness is a start but mine took three months to arrive, be warned. You might consider Hyrlo and/or Doepfer A138s for mixing. There are lots of other possibilities. On the attenuversion side, 3xMIA, Frap Tools 321, and again many other possibilities.
If you're using the VB regularly, then stick with it until you can build a compelling argument otherwise.