As far as I know, you'll have to mod your jp MD if you want it to work with an american Sega-CD, other than that, you're fine (of course the usual electric resistance and etc of the product should be verified, but you already know that

)
Other MD games:
-Castlevania Bloodlines (my favorite gameplay in the series, this one is actually fast!)
-SoR 1-3 (my favorite is 1, with 3 close behind it. I used to love 2 when I was younger, but now it feels weird... )
-Golden Axe 2 (well, I like it better than the port)
-Altered Beast (if you're into 2D nostalgia and all - I love this game, but it seems a lot of people hate it... I say give it a shot in emulation, then see if you like it)
-Fatal Fury 1 (if you already own the NG version, you'll be surprised to know that... the Genesis port plays better than the original! Even the special move inputs were different... A lot of fun!)
-Shining Force 1-2 (BEST strategy rpg series that EVER EXISTED!!)
-Sonic 1 (a classic that amazes me, how could all that fit a mere 4-Meg cartridge??)
-Sonic 2/3/ & Knuckles (nothing really new added, only more of the same, but when it comes to Sonic, that's more than enough for me

)
-Alien Soldier (2D insanity by the same folks who created Gunstar Heroes, IIRC)
-Contra: Hard Corps
-Castle of Illusion (considered by many a classic)
-Phantasy Star 2-4 (there was also a port of PS1, but it's japanese-only)
-Langrisser 1-2 (strategy rpg, more technical - and slow - than Shining Force, but if you're into srpg, you'll love it. Only part 1 was released in the US, though, renamed Warsong)
-Daimakaimura (Ghouls 'n' Ghosts... Addictive!)
-Strider
-X-Men 1-2 (Everyone says 2 is the best, but I still prefer the original)
-Quackshot (Hey, this game was good! The graphics are still nice)
-Revenge of Shinobi, Shadow Dancer, Shinobi 2 (good games, Shinobi 2 got curiously renamed in the US as Shnobi 3 :P)
And there's more, but I'd be giving you MY favorites list. I believe the majority of people here will agree with most games I posted.