Vita sounds like the obvious choice IMO, if it is released by the time you head home. I doubt you can go wrong with one.
I would also highly recommend the 3DS, especially because your brother hasn't got a DS. The 3DS has full DS backwards compatability (with the exceptions of games needing certain attachable peripherals like Guitar Hero). The DS in itself has a fantastic library (IMO the greatest of all consoles) and is certain to please pretty much any taste. That's not even to mention the 3DS library (which atm isn't much, but at the end of the year will include MK amongst others).








