A good place to start might be to do some surfing on this site:
http://www.sksboards.com/smf/index.php
Go to the particular section that you want (i.e. General SKS, Russian, Chinese, SKS Accessories, etc.) and type your search words inside quotation marks, for example, "tech sights". You should receive plenty of reviews.
I haven't tried the Timbersmith stocks, but all who have bought them are impressed thus far.
And if you are patient with Gunbroker, and you can find a decent FFL transfer agent, you can find good deals. This NIB Chinese went for $225.
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=232292155
Even with the $40 shipping, you could have a decent gun home for around $300. And nine more sold for $225 or less on Gunbroker in the last 90 days. Use patience, you will find one!