Convert.
I've owned over a dozen Saiga's. I even managed to keep one 7.62x39 sporter in stock form for almost three years while I bought, converted, and sold others. I'd drag it out of the safe, take it to the range with it's prettier converted siblings, fire a few rounds thru it and put it away for next time.
Bottom line is, the stock is horrible. It's hollow junk that the russians thru on knowing that the gun was going to be converted.
The stock trigger is horrible. It's long, gritty, has a poor break, real piece of crap. And, the gun has no balance. Period.
If you want to keep it in stock condition without converting, I'd suggest keeping an eye on eBay or the Saiga forum and look for someones .308 rifle wooden furniture. It may or may not fit on a 7.62 or .223 gun, no promises, but at least it's better than the plastic junk that comes on the other models.
Also, go to the Dinzag Arms website, there's tons of conversion parts, tutorials, and answers. But, again, if you're keeping the gun stock, they offer a much better trigger for stock guns that will greatly improve the trigger feel.
Don't panic about the conversion. It's really easy. If you have a pulse and opposable thumbs, you can do the conversion. You'll sweat thru the first one, then when it's done you'll say "Wow, that was easy" and you'll be hooked and blow right thru the next one. (Yes, they're addicting and you WILL get another one.) You'll need some really basic handtools, the tutorial handy, and about three hours. It's really no biggie. The gun will have much better trigger and balance.