I'm pretty satisfied with this setup. When I made it, a halfassed router table was a good 200 bucks and could'nt switch between my router and saw like this one. My DIY table is 24x38 inches. It's any size you like when you make your own.
Nowdays, Chinese ingenuity (slave labor) might make a big, sturdy, collapsable, affordable cast iron or aluminum table with inserts, a miter gauge slot, whatever. But DIY is something money can't buy.
If I was only rabbeting, my first choice would be a saw with a dado blade. Routing out a groove or rabbet involves removing pretty much wood. Router bits are small; they quickly heat up, dull, and burn wood.
If you follow the advice of others here, be careful. Cutting rabbets in two passes on a table saw will probably have you setting the fence close to the blade, with the waste piece of wood between the fence and blade. That's asking for kickout unless you have a backup on your pushblock.
You probably know all of this. In fact, that would make for some good MTV Jackass videos; strips of wood shooting out of table saws hitting guys in the crumple zone.
I bought a cheap $25 electric planer (pic), never used it yet. It has a rabbet guide. It might cut rabbets easier than a top-heavy router.