Both rifles are accurate. The SKS is a lot cheaper to get the rifle as well as the ammo. 7.62x39 ammo s a ton cheaper than 30-06. But you will get more range from the 30-06 round. It comes down to just what are you going to use the rifle for? Me personally I have not had a big desire to get a Mini 14. I do like the round but I don't see me getting that particular rifle. I have an SKS (link to pic)and I really like it. I put a totally different stock on it and it really made a difference in the look and overall feel of the weapon. With good ammo it will shoot at 200 yards and group pretty well. I opted to get a D type (Chinese) SKS so I could use the same mags as my Yugoslavian AK uses but if one was to get one of the Russian or East German models they can be a bit more accurate.
Really both are good rifles and there is a difference in cost for a reason when looking at these two weapons head to head. The Mini 14's are really well built and with the right ammo will really reach out and touch something. For me the it's hard to justify the cost for what I would use it for (range fun).I have other rifles that I use for longer range shooting and have some projects brewing for others. I can shoot a lot more with thew lower cost "commie ammo. And there is a ton of things made to make an SKS fit you better.
With the low cost of an SKS it's really hard to not get one really. It's not like you will take a wallet hit that would make thew other rifle unreachable later. Depending on what model you are looking at an SKS can be pretty cheap. Even some of the better models are not expensive at all. I got mine for 300.00 and put another 50 bucks into a Tapco T6 Fusion stock.
That is a really good price you quoted for the Ruger though. Most I see are 600 and up. You get the Ruger you will have a really good rifle, no doubt about it.