Yes, I too vote for the 7.62x39mm version. There are already going to be plenty of .20-caliber weapons like the M16, M4, Five-seveN, FAMAS, SIG 551, G11 (and that's even smaller; .18 caliber!). The slow rate of fire coupled with the specifics of the 7.62x39mm cartridge gives the AKM a very characteristic sound, and personally I love it.
I have myself on video dumping a full 30 round mag out of a Russian underfolder on full auto. Now THAT'S fun! /infopop/emoticons/icon_smile.gif
Gryphon/JTF2