Just for some clarification about the original point of the post. As far as the budget range you were pointed in, there are some fine saws for what they are in that price range. Most of the answers here were along the lines of "if it isn't a high end cabinet saw it's crap", or similar. Which is a fine and legitimate point of view, but somewhat flawed. The saws you were looking at were either bench top, or contractor type saws. If you have nothing but tons of money, and space, not to mention 220v power routed into your shop, a big cabinet saw sure is nice to work on. But I can tell you, at least two of the saws you mentioned in your first post (which are really the same saw with different color plastics and name badges) are once set up, nice cutting solid running saws...
Take a good look at the Craftsman 21806 http://www.sears.com/shc/s/p_10153_1...=&cName=&sName
and the Ryobi BTS21 http://www.homedepot.com/webapp/wcs/...ctId=100593232
and you will see they are essentially the same saw with different color plastic, different paint on the table, and a different name plate.
I have had my BTS21 for less than 2 months now, but I have already clocked about 24 working hours on it, and have loaned it to a friend for him to finish up a cabinet project. After a short setup that is well documented in the manual, we both found this saw to run strong and straight running through pine, birch, oak, solid, ply, and of course lots of MDF.
If you read the reviews on both saws, yeah there is going to be a bad review, every product should have them, but they are essentially a very good contractor type saw.
I am sure you will be happy with your Ridgid, and I would have totally been all over buying one myself if I could have swung that sort of deal... But just remember, just because you have the expensive brand names doesn't mean you are a great woodworker. That comes from you, not your tools...