Gents,
I have a Ruger Mini-30 purchased in 2001 and a Mini-14 purchased earlier this year. Both are the stainless steel synthetic stocked version (All Weather in Rugerese).
The Mini-30 has seen 5,000 rounds of Wolf ammo without a hitch on its part. I use the Wolf 123 grain hollow point, and the rifle gives solid 2 MOA accuracy. It is the ranch rifle with the flip up peep. The sight picture is fast to acquire and the peep and front sight are nicely mated, IMO. The rifling is still crisp and not worn when inspected by unaided eye. The actio has smoothed out, but I see no question as to its ability to go another 5,000 rounds without a hitch.
The Mini-14 has the new sights, and I like these even more than the flip up peeps. They present a sight picture very similar to any Garand, M-14 or US Carbine shooter. These sights are also more durable than the flip up sights, IMO. This rifle is not as accurate as the Mini-30, but it gives solid 2-3 MOA performance with Wolf 55 grain FMJ steel cased ammo. I have about 700 rounds through the rifle with no problems.
Currently I have found that the 7.62x39 ammunition is not as cheap as it used to be, and it seems that the 5.56 is more readily available, and in many different flavors at quite reasonable prices.
Gun wise I would go with either (both now have the new peep sight), depending on what your needs are for the firearm; mid size game hunting hunting gives the 7.62 the nod, whereas to me, plinking and jump hunting of varmints gives the nod to the Mini-14.