Box-fed semi-auto 308 rundown;
If you want a rifle that's the coolest in Greatest Generation-era form with iron sights; M14 for its history and tenuous Garand connections
If you want what the M14 was supposed to be; Beretta BM59
If you want a highly impressive tack driver; AR15 in 308 from some high-end maker that sells accurized platforms
If you want a highly impressive-looking tack driver to woo the ladies; The same AR with a bunch of junk hung on a quad rail and a complex stock
If you want something unstoppable but with no other redeeming qualities; PTR/G3/CETME
If you are a hipster who's into cool swag that the mainstream is too dumb to appreciate; MAS 49/56 conversion
If you are a Fudd, friendly or otherwise; Remington R25
If you are an 8ft tall Ubermensch with a (local) Swiss bank account; SIG AMT or STGW57/PE57
If you want something boringly functional and adequate; FAL
If you want an elegant weapon from a more civilized age; FN49
If you are a cheap SOB at heart and vulnerable to Ban Panic; Saiga 308
If you area rich SOB; Galil, Daewoo, WA2000, SVD, PSG1, or other unobtainables not listed
If you want an accurate platform built on a concept suited for anything but that role; VEPR or new-production M76, as well as PSLs and M77
If you want a 1MOA repeater that takes 5,10,20 round mags, is set up for optics-only bench/blind shooting, and costs an arm but no leg; FNAR/SXAR
If you are bored with buying guns, think about building many of the above and gain a whole appreciation (or hatred) for your 'favorite' platform