I know it wasn't mentioned in the first post, but is cost a factor at all? Are you really shopping or just wishing? Cost always comes into play and in this instance, it would help to narrow the cartridge down to a single unit. I also take it "out of box" means that you want something you can still get brand new and hopefully serviced or parts for??
If you only had less than 500.00 that is a whole different set of availables than if you have 2k to spend. And then are you really interested in some foreign caliber like 7.62 x 39? Or the French 7.5 x 54?
Did you come to a conclusion on what YOU might be looking for? These posts always stay so open ended.
The mini 14 can be a nice little carbine if you are on a budget. But it is not known for it's accuracy. Price (estimated) 450.00 - 600.00
The AR 15 rifles are great performers, with accuracy and reliability on their side, as long as you keep them clean. price 800 - 1200
AK's, ultra reliable (as long as the builder does their part) but not known for accuracy. price 400 - 900
Other choices in ARs and 5.56, AR-180, Daewoo K-2, XCR, M-96, Sig 556, FS 2000, M-17, plus a few other harder to get things like FAMAS and original SIG 550 or FNC.
There are the old standbys like M-1 carbine, M-1 Rifle, FN-49, Hakim, Mas 49/56, Rashid, Johnson 1941, Century M-53, RPD, RPK, etc., etc. Older designs but reliable and some can be very accurate.
Then the ever popular 7.62 x 51 FALs, HK-91, Cetme, L1A1, M1A, AR-10s, SR-25s, Sig AMT, Saigas, Valmet, Galil, even the new Kel-Tec RFB.
You can see there are lots of choices and lots of opinions. I suspect that anything used by a tried and true military body will give you good service. Reed Knights SR-25 is used by SEALS and other Special Forces units. That is a pretty big endorsement. It is supremely accurate and if cared for properly and fed properly, is also reliable. But it will set you back at least 3k. And with that said, I believe you have some reading to do. Eventually it will be YOUR opinion that will count as well. All the best.