Hi m3877,
First off, with the CETMEs, you need to determine if you are purchasing one with a bolt that has been grounded. If the dealer will allow you to take out the bolt carrier and bolt, take a look the back of the bolt. There should still be some bluing on it as well as the curved edges. If there isn't any indication of either, then it most certainly is a bolt that has been grounded. Check for headspace on gapping by using some feeler guages...heck, just visit this site to get all the info: http://www.cetmerifles.com/forum/index.php
The CETME that comes in the synthetic G3 stock is called the Black Widow. The current ones from CAI are now required to have the MB removed because of some odd reason. I suggest that you pick up one with a cast receiver and preferably sporting the wood buttstock and forearm, but that is my personal preference. I have one of each.
As for pricing of these rifles, they can be had for around $339 with 3 20 round mags and a 5 rounder.
HTH