If you search google, chances are you'll find reviews for most of what you're looking for in terms of reviews. They may not be side by side comparative reviews, but you'll find independent reviews of the different guns.
As stated, stay away from Chinese M14s. The first M14 I got to try was a TM, and it was an awesome gun in every way. Not my style of weapon by a long shot, but still, it was an excellent gun all around. Since then, I've gotten to handle a couple of clones, and was very, very disappointed with them for both feel and performance. For M14s, TM are the top of the pile, followed by CA. The rest aren't really worthwhile buying IMO.
Sorry. Can't help you wiht the other guns...