any version of blender will do (im pretty sure).
about your mod, it doesnt matter how good your models are, if the game sucks, no one's going to play it. ive seen many times where a mod looks good, but the gameplay is as good as dirt. personally, i think that gameplay is the more crucial part of a mod. now, dont get me wrong, models are definitely a large part of the mod, and stuff like that will make the mod better; its just that you cant forget about the gameplay...
-Zoy