Going through the same agonizing decision myself. Either a 16'' Vepr 308 Version 2, or a 16'' Saiga 308. Seems like a the Saiga has more options for magazines, and furniture, but the Vepr comes almost readily converted with only a few parts needed for 922r.
I'm pretty well read on the Saiga 308, lurking these forums and what not. I wish I knew more about the Veprs, and if it would be as viable converting to a battle rifle type setup.