honestly, if you want a good quality M14, TM is your only choice. They make the best M14s on the market. sure, you can get an AGM or a CYMA, but their tolerances will be off slightly, so even if you upgrade it to the same level as a TM, it will not be as good.
If you have your heart set on an M14, but cannot buy a TM (your mistake though), get an Echo-1 M14. That would mostly likely be your best bet.
hope that helps