^That is the truth. But at least you're not ignorant like most. Plus you're a great skinner.
Like others have suggested, I would go with either the Evo or SCDS1. Both my are my favorite carts. I like the SCDS1 a little more because the RTS seems more compatible with most games(although since 1.3 on the Evo, RTS has gotten a lot better), and other features like real time guide(Evo is suppose to be gettinng it soon though) and soft resttable homebrew. Plus the SCDS1 is cheaper, and has more of a sophisticated GUI. But since you're used to the R4, you might feel more at him with the Evo, since the have similar, simple, GUI's.
Also...the Supercard Team is just kick ass. You know the SCDS1 will get supported for a very long time to come(just like their slot 2's).
But seriously though, these are the top two slot 1's, and it really doesn't matter which one you get. They're pretty similar in terms of features(as Urza pointed out in his comparison) and performance. I'm sure you'll be very happy with either one. I know I am.