I have both a WASR-10 and a Yugo, BTW.
SAR-1 - Takes hi-cap AK mags, built pretty solid, about 350 bucks give or take 50. Can be bump-fired for ammo-burning entertainment, and it can serve well as a defensive carbine.
Yugo SKS - The poor man's MBR. Fixed mag, built like a dump truck, about 100+ bucks if you get it from SOG/CDNN/etc. A bit more accurate, but I suspect that's mostly because of the longer sight radius. Easily reloaded with stripper clips, and it has less recoil because it's heavier.
If you had to have one SHTF rifle, I'd take the AK - carrying ammo around in mags is much more practical, IMHO, and there are parts and mags for it everywhere.
If you don't want to spend 300+ bucks getting a Romanian AK, just get a Yugo. Works fine, has the neat bayonet, and it'll probably be more than enough gun for plinking and SHTF.