UMvC3 is dead, didn't you get the memo? Morrigan/Vergil/Doom? Firebrand flopping?
I kid, I kid...
I think it might be best to stick with Skullgirls or SF4. Skullgirls because of it's complexity and yet limited roster of characters, and SF4 due to it's perceived simplicty and smaller roster of what's out there. (Still alot, but small compared to MvC or KoF)
You still should do that D-Pad mod in my previous post. It makes the Pad a lot easier to deal with, and you don't even have to source the plastic. I used a laminated construction paper table menu for my shim (~0.5mm)