I agree that aftermarket parts for these guns are usually junk especially the hi capacity magazines. The only aftermarket part I would use on a SKS is the a receiver cover/scope mount like this one and the part still might need 'worked on' to make it fit right on your rifle. http://www.centerfiresystems.com/MNTSKS03.aspx
Also remember the 922r regulations about making changes to the sks. Tapco sells 922r compliant parts..... http://www.tapco.com/products/sks/index.php?_a=viewCat&catId=36
Also check out this site about the 922r laws
http://thegunwiki.com/Gunwiki/LegalFederal922rParts
I've owned dozens of sks rifles over the years and have always enjoyed shooting them even more than my AK47's. The weight and length of the SKS fits me much better than the AK47. Usually the triggers on the sks feels like your rubbing two pieces of sand paper together when you're firing it, but that can be fixed. I got lucky on a Romanian made sks that has a buttery smooth trigger from the factory.
Keep it stock, buy some stripper clips and you'll have fun with it.
Side note... I bought my first sks for $88 about 17 years ago and I've watched them consistently rise in price ever since and the last couple I bought was last year for $225 for a plane Jane Chinese Norinco and $400 for a Norinco SKS-M (uses ak mags). If I remember right, they aren't being imported anymore so whatever is here in the USA is it. Someone in Canada got a shipment of I believe Romanian sks' last year and they sold out very quickly. Guys in the US was dying to get there hands on them..