No CM for the S4 (Exynos, at least; unless some other dev/dev team picks it up) is a giant turn-off for me. I was really looking forward to purchasing either the One or S4 but it looks like I'll be sticking with the DNA for a while. Although the HTC One developer's edition may be a viable option, I'm still waiting for confirmation on S-OFF there. That would probably make me switch.
Excuse my ignorance but what's cm?