Yeah, I'd definitely buy a multi-mega in a nice smaller case, it'd rock! I do have one already but I don't play it. I do however have my megadrive 2/megaCD 2 setup in my room which gets used damn loads. Ooh it's sweeeeeet. Now... just need to get to some bootsales and grab some more games!
I'd probably buy that little plug and play thing too,mainly cos I'd want to see what it's like, don't care if it's only a few games.