Have you considered other cartridges? Perhaps you might do well with a high output MC, something like the Denon 103 that some here have reported to be pretty darn good for under $300. Given what you have had prior experiences with, something like this might be an "ear-opener". Don't know how it might work on your table, but you might want to ask around.
If you are set on the V15, you're in pretty good shape, though.
Belts can be found at Projector-Recorder Belt Company in Whitewater, Wisconsin. They are the actual manufacturer of alot of OEM belts and you don't have to pay for 5 middle-man mark-ups.