Marty,
I would buy a sawstop if my livelihood depended on it. I have a General 350 that I have had for 30 years. Hard to let go of it for what I would have to have. I have a friend who almost lost a thumb and what is that worth. I also have a delta contractor saw with a excaliber sliding table mounted on it and yes I can cut a 4x8 sheet in two. So I do understand your delema. I checked out the grizzle aftermarketslider and the slifing tablesaw and the one problem is one almost gets trapped in front of the blade when ripping. I had an old delta that did that and it was spooky to say the least. Just remember that there is alot of different functions a table saw does and if you want the kind of protection a sawstop offers than the sliders won't do you any good. If you have the money go for it. Just make sure you won't get trapped close to the throw of the blade when ripping. It is something one doesn't think about untill it is to late.