I wouldn't bother to put a scope on an SKS, but I also don't own an SKS. You should do what you want.
If you will go with a fixed 4x, consider Weaver's 4x28mm Scout scope from their Classic K series. I think you can find it for under $300. Hi-Lux makes a 2-7x32 intermediate eye relief scope for scout mounts. Or they did. If you like this idea but can't find one new, pm me and I'll sell you mine, which I haven't gotten around to using in over a year so I probably never will. It'll be cheaper than the Weaver.