$200 to maybe $250 price tag.
I don't need it to be as powerful as my PS4, since I don't expect Nintendo to ever get all the games I want anyway, which means that I'd keep the PS4 for those other games anyways. More powerful than the Wii U would be nice though.
A good Zelda (like BotW looks to become) and a couple other games I want, I do like 3D Mario from time to time for instance and if, and I'll believe that when I see it, the Pokemon Company actually releases a fullfledged HD Pokemon game (and I don't mean a halfassed HD version of a 3DS game that I expect Pokemon Star to be) then that'd be pretty tempting too.
Don't do a system that I find so absolutely stupid that I don't want to support it on principle aka don't repeat the Wii U.
But if they just became a third party dev that'd be a lot more preferable to me.