I own no non-US releases, but I like:
Space Harrier
Space Harrier 3D
Golvellius
All of the Wonder Boy's, particularly 1 and 3, for entirely different reasons.
Zaxxon 3D
And it's a no-brainer (and I don't own the US release), but Sonic is seriously a must-have for anyone who wants to showcase his collection to fellow geeks. It shows the SMS's capabilities like no other game I know of.
From other threads, I think you're a touch like me with the Pokemon/collector 'gotta have it all' bug. If I'm right there, grab it, up till $50 anyway. If it's boxed, $70's cool. Master Systems had different built-in games on lots of consoles, 4 or more variants I believe. So like a true geek, I want all from snail maze to the 2 game consoles. Also, I paid $40 shipped for my first set of guaranteed to work 3D glasses, and they were cracked, right down the middle. Still happy with the purchase. And I buy-n-sell for a living, so I'm a cheap-ass. Got em on DP![]()