Wow thanks for the info. A ton of information.
Just to give you some more information about my information...
I am a novice woodworker that does projects in my garage. That is why I have the 7491 table saw. I need to be able to fold it up and store it to the side when not using it. I wish I had room for cabinet table saw, but unfortunately I do not. I mentioned the Dewalt and the Diablo because I saw them as available in my local stores. I know nothing about them so I used them as examples.
I have done a lot of searching on this site and did some several mentions of this dado:
Oshlun SDS-0842 8-Inch 42 Tooth Stack Dado Set with 5/8-Inch Arbor - Dado Saw Blades - Amazon.com . The reviews are good and the cost is not terrible. I have never used a dado so this is my first. I do not want to spend a ton of $ on it because of that, but I also don't want to buy something that is junk or a pain to use.
You suggested getting a 6" dado instead of 8". So my saw is not powerful enough to run an 8" and its only a 1" net difference in the dado cut depth?
For the throat plate, I have seen them advertised for sale for about $20-$30, which seemed reasonable. I looked into making a zci, but with a low price and the level of detail needed for it to fit correctly, I thought the $20 or whatever it would cost to buy was worth it to purchase. So basically I was just considering the LOE vs the cost on it and I thought it seemed like the cost was low enough to buy. Maybe I am wrong about that.