as much as i hate people using E30s for winter cars...such a waste of an amazing car...that asside,
i say find an ES cause it will come with LSD and the engine is good for 400k+ miles... my ES has 360k miles on it so far and runs like a champ, still has the stock headgasket
you may want to consider an old subaru for awd or VW/honda for fwd or something as a beater...RWD is the worst in the snow..rain and snow loves AWD/FWD