I've been enjoying my shield as an emulation device as well as media and I already have some usb snes and nes controllers that work great on the shield. However I'd like to play some mame games as well and wouldn't mind getting an arcade stick for this (I'm currently using my PS4 controller but it's just not the same). However I know a lot of arcade sticks are marketed as fighting game sticks and cost a lot of money. I'm after just a decent arcade stick (probably to play either beat-em-ups or metal slug). Would I be safe just getting some inexpensive usb one off ebay or are there any particular sticks you'd recommend?