If you're looking for an M14, your options are somewhat limited. The most common ones available are the Springfield Armory M1A or one of the variants offered. There are other M1A's made by a few other companies as well.
To the best of my knowledge, there are only a VERY few transferable actual honest M14 rifles out in circulation--since they are select-fire weapons, they fall under the NFA. And, to get one of these, you WILL pay a steep tariff--if you can find one.