If you're impatient and want to go on a core drought, you can try to get specific 5-stars that are "top-tier" and get them to x5. If you're a bit more patient however, select 3/4 stars can get you through the current game. If you still have M14s, I would advise leveling them up and getting them to at least x4, as M14 is the best budget RF.
If you still aren't sure, you can level almost anything that's on the tier list or this site, get it to x4 and enhance it appropriately, and they should be usable.
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