If you're suggesting buying an EX2 just to swap the buttons and stick, wouldn't it make more sense to just buy the SE fightstick, since it has quick disconnects and a better case? Of course, actually getting the parts would push the price well over the budget set by the thread starter. I bet it's gonna be an EX2 like every other game-branded Hori stick. Except wireless.
Nah, there's a new shell for the T6 stick. Looks pretty nice. There's also a Real Arcade Pro coming of it, but they'll just have hori parts. I suggested the EX2 because of the PCB being 360 workable and the stick being relatively cheap and case being pretty sturdy. The SF4 SE fightstick is a bit expensive IMO, doesn't look very nice either. But if the OP doesn't have a specific budget then he could splash out or whatever. In conclusion, a TE is gonna be most cost effective probably. Even if 8 buttons layouts are disgusting.