lol a portable emulation machine is what you want eh?!
ok, do you have a smartphone or tablet? nowadays, you can get, a psp,dreamcast,sega Saturn, ds, all the old systems like 2600,nes,gba,gbc etc, even ps1.
you can get retroarch, or stand alone emulators (retroarc has a crappy ui), and get either a bluetoot controller, or a moga hero controller. BAM perfect portable emulation machine.
but, since having a lot of ds games can get big memory wise, and I love ds, and it has buttons lol, and I don't waste my phone battery by playing m ds, I did get a flashcart. it is nice to have both worlds.