If you see a scope you like that is calibrated for a .223 AR, get it. The trajectory of 7.62x51 147 grain M80 ball is nearly identical to 55 and 62 grain 5.56 (which is what those 5.56 scopes are all calibrated for) out to 600 yards. I have had a Burris TAC30 on 3 different .308s (a M-14 and two different ARs), and it's 5.56 reticle was good for consistent torso hits out to 600 yards on the M-14... I only confirmed it out to 500 on the .308 ARs, but it was dead on. Also those .308 ARs had 18" barrels, which is real close to what your CETME has.
FWIW I highly recommend the Burris TAC30/MTAC. In fact it is the cheapest one I would recommend, as it's pretty much the cheapest you can go without getting into Chinese glass, which is universally awful.
I also would recommend against anything with a fixed ACOG-type base, like the Primary Arms model mentioned above and the similar Burris AR332. Sure they are compact like you want, but they would just sit way too high for any kind of comfortable precision shooting position with the drop at comb the CETME has. No amount of raising the cheek rest is going to change that. Believe me, I've already been through this trying to make an ACOG work on an M-14. I would get a tube body scope, mount it in the lowest rings that will clear, and build up the comb to match.