I find the TTS-1 to be the least finicky synth I've tried with BIAB. Will miss it, if it goes away.
Have not had the best of luck with VSTSynthFont64 (especially the new current, 3.5 version).

They still have the Roland Sound Canvas VST's for sale at Sweetwater for $69, although there are only a few reviews and they're' not all stellar. Has anyone here tried it?