What handheld is available right now, and will satiate my hunger until my RP6 arrives?

Anything and everything is a welcome recommendation. I play mostly SNES, NES, and maybe PS1, and PS2. Though the PS1 and PS2 are not a deal breaker.

I realize that opens it up to just about everything. But the whole point is to see what handhelds I may not know of but are still great handhelds.