Your rigid opinion on the 3ds library, has no bearing on if people treat phones as actual gaming devices.Such a thing is also why I skipped the 3ds and to this day consider a weak offering, though as I also skipped owning a phone or tablet I am not sure what I did.
I still don't think regular phones are comparable to actually game devices. I really do think controls really hurts that transition. Xperia Play fixed the design issue and power is decent even for cheaper phones. Until more companies make phones with gamepads or at least a clip-on specifically for their phones included, phones will be limited game wise. Ideally, a true gaming phone would have physical media like carts, but unfortunately that is asking too much.
Ask for battery, it can have a bigger battery than regular phones, if it isn't trying to win "I'm the thinnest" contest. This phone shouldn't cost more than $600, if not less than $500.