One thing to consider is the future use of the saw. You say "now" that you only plan to rip narrow stock with the saw, but in the future, I can almost guarantee you that you will do other things with it as well. I'm not saying you need to step up to a cabinet saw or anything like that, but you might want to reconsider your options a little bit with the saws you're considering. I've read some less than complimentary things about that Jet saw. I'm only going from memory, but one was that there isn't an arbor lock on the saw. Meaning the depth setting can and will change in the middle of a cut. That is a MAJOR PITA to deal with on a TS. There were some other drawbacks that I read somewhere on that saw too, but I'm drawing a blank at the moment.
The Dewalt saw you mentioned isn't for everyone. People seem to either love it, or they really hate it. I personally am in the camp that hates it. IMO, its under powered and the fence is just not anywhere near my liking. To be fair, those that like it usually do so because they like the fence and how light weight it is. Different strokes for different folks, I guess?
There is a thread here about comparing the Rigid saw to the Bosch saw in this off-topic section. Matthew started the thread and did an excellent job of being impartial. You should check that out before you buy anything. The Rigid was just selling for $299 with the stand included. Maybe you could still get it for that price??? If so, it would blow the doors off the Jet saw and do so for only around $100(including tax) more out of your pocket. I've had mine for around ten years now and can vouch for their durability and build quality. With a saw like the Rigid, you get the ability to put a dado blade on it, a really top notch fence (the best fence on any portable saw, IMO), plenty of power, and a saw with a proven track record that will be trouble free for a LOT of years to come. Time will tell how well those Jet saws are going to hold up, but I doubt they're as well made as the Rigid. What may appear to be a bargain today, could be nothing more than a waste of money down the road.
Just my opinion, but go down to your local HD and see if you can still get the $299 price on the Rigid. If you can, buy it as fast as you can. If not, then look around a good bit more.