The Mini-14 isn't known to be a long range varmint rifle, so I'd stay away from the high power stuff.
If I were you I'd think about one of these units.
Something new from Leupold...and they make good stuff. The low power will make it quick to come to target, and 4X is enough for almost all shooting at reasonable ranges. Plus, the scope is small, and won't look out of place on the small rifle and the "Hog-Plex" seems like it will not get lost in the branches and stuff in twilight hours.
If you go the "tactical" route, you'll have to pony up some serious cash for quality optics..
Mine is an old Ranch Rifle version and does pretty well within a couple hundred yards on cans and milk jugs. I've got a Leupold VX-3 1.5-5 on mine with a heavy duplex recticle. Just happened to have the scope laying around after taking it off a deer rifle...little bit pricey to grace a Mini-14, but it has been working very well for me.
The Mini's are nice guns....just make sure to use Ruger magazines and it should be 100%. Don't go for the cheap knock-off mags and you won't be sorry.