The fence on that Grizzly isn't much better than the old Emerson fence on your 113. Rugged enough saw, is right tilt, and is worth more like $250 IMO.
The 3650 is a nice saw....$400 a bit steep IMO, but $$300-$325ish would be fair. Ironically, the 3650 is extremely similar to your 113 under the hood...some parts are even interchangeable. What you gain is solid cast iron wings, the Herculift, a much better fence, and an improved serpentine belt drive and pulleys.
The Delta with the Unifence is a nice saw too. $500 is also steep IMO. The Unifence is nice, it looks to have at least one solid cast wing, nice mobile base, but it's still an old school contractor saw with an outboard motor, traditional splitter vs a riving knife, is right tilt and no warranty. $350-$400ish is fair IMO. At some price point a new saw does come into play, but I doubt most of the new $600 saws are built as well as this.
This Craftsman is a good deal. Similar to your saw and the 3650, has a cast router table, and an upgraded fence similar to the Ridgid's. $150 is a good deal.
This one could also be worth a look and an offer:
Ditto this one:
Add wings....great fence:
This one is rough, but is a giveway price, and should clean up ok. The motor and fence are worth twice the asking price if the motor runs.
What to pay is always a subjective and is a personal choice. Doesn't hurt to take a look, and make a fair offer for something....worse they can say is "no" and call you names! ;-)