I would love to get a copy of MPE, as I enjoy it, but I also love MD3. They are similar, but different enough I wouldn't mind having them both. Although, comparing the Magical Drop games, if you can find MD3, I wouldn't really bother with MD2. Seems they polished it quite a bit and have made MD3 a much better game with a lot more modes than MD2.
Also, for those with the Unibios installed and MD3, definitely change it over to Japanese. All of the characters will have unique voices instead of the one generic voice in the US version. All you really need to know in Japanese, the menu is (from top to bottom), Puzzle (1P only), Versus (1P or 2P), and Story (Board game like) mode (I can't remember, not really a fan of this one).