Skip the old table top craftsman saws. I had one, and other than the noise, I would rather have your dewalt.
I grew up with a craftsman (113) contractors saw, and its merely ok. For 500 ish dollars if you look you should be able to find a delta unisaw.
I have a late 90's unisaw with overarm guard and its so nice compared to my dads craftsman its not even funny. I spent a little more than 500 dollars but it was cherry, had a mobile base, the overarm guard and an outfeed table.
But cutting ply, why with a table saw. I use a dewalt track saw. So much easier, more accurate, and less(almost none if you cut on a sheet of foam) dust hooked up to a vacuum.
I still use the table saw to rip hardwoods and cut finger joints and such, but if I "HAD" to choose either it or a mitersaw and tracksaw I would pick the latter pair. With a MFT style table you could even do most of what a miter saw does, very portable.
I haven't cut ply on a table saw in a while since I got a tracksaw and build a MFT style bench/router table combo.