Get Aved, there's a few m14s for sale on the forums. I would personally choose the g&g m14 over the CA. They use the same mags, which are expensive. If you buy a used one (I'm not peddling mine, I swear, but it is for sale lol) that comes with mags, you'll be better off. These 2 guns are not TM compatible when it comes to mags. Internals are a mix and match of TM and g&g's own. CA is essentially a clone of the G&G. Parts used to be harder to get for them, but these days any number of vendors have access to the high quality parts coming from lonex made specifically for g&g m14s.
The other parts that may break that need replacing eventually can be had direct form g&g in taiwan.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.