Richard, I cycled thru your choices a few years back. $ was the issue.
I ended up with a Vega Pro 26" fence and the link-belt system. I was
VERY impressed at improvements. I could repeatedly cut to 1/32. For a
weekend warrior, this is plenty. The Sears fence was so out of wack I
never realized it until I put the new vega fence alongside. Would I get
the link again? you bet. I never considered slipping, it was the issue
of set/vibration. I put link belt on jointer, drill press, saw and
something else? I also got the replacement pulleys, but don't recall
that adding any specific value. Google the link belts, everyone sells
them and will run ~ $25 for each tool you put it on. Will it transfer
more power? Never thought of that. If the belt slips, the motor might
not be loose enough to hanging freely. A slipping belt makes weird
sounds and stinks. Link belts won't fix this, that is not thier intent.
I ended up selling my Sears and getting a Unisaw. Once again I am
amazed at difference in tools. Things like the side of Sears saw
flexing when angling blade, a zillion turns to move blade up high,
sharp webed wings etc.
Just my .01 cents. Tom