I've written off buying an FC Mobile. My problem isn't your fault, but Nintendo's fault- the cartridges are bigger than the system and just stick out too far.

The portable Genesis I would buy. Face it, Sega's licensing this thing out for 2 reasons-

1) They keep making medoicre games and are losing money, they need whatever income they can get.

2) they know the Sega Nomad was pure garbage.

You want to include 20 games. Stuck, no doubt, with only the Sega library and no 3rd party stuff. Problem is, sticking in the Sonic games is pointless because most anyone buying this to play cartridges has the Sonic games.

Since this will be a handheld and the combined cartridges would stick ot and risk game lockups from shaking, see if they'll let you slap on the combined Sonic 2/Sonic & Knuckles and combined Sonic 3/Sonic & Knuckles ROMs. This is possible as the separate combined games were unlockables in Mega Collection. There's also Blue Sphere, the game you could access when locking Sonic 1 onto S & K.

Honestly, you'd be better of cutting it down to between 5 and 10 games, otherwise you'll compete with all those non-cartridge handhelds Sega licensed out. Though I'm certain if you contacted Wisdom Tree, they'd license out the Genesis ports of their games for dirt cheap if you wanted filler.

I wouldn't worry about 32X compatibility. It'd be too heavy anyway and the damn 32X needs to be plugged in.