Hi, Kirk
In the RF vs SLR issue, I would say that if you want to stay within that focal length range, either Contax system will perform admirably. Obviously, the SLR offers more versatility (possibility of macro, long teles, faster lenses...).
I don't have experience with Canon, but they seem to be more technologically advanced than Contax, the transition to digital will be easier and some of their lenses are said to be as good as Zeiss. Choosing Contax seems more an emotional decision than a rational one (but see who is talking...)
I own NX and G2 (I have said in other thread that I wish I had spent the extra US$ 300 last year and bought the N1 instead of the NX, but that is a different story). If I had to choose only one I would take the NX, mainly because I prefer long lenses. The G2 does feel more solid and a better camera (definitely a luxury item), and the lenses are amazing. But it is, by definition, more limited than an SLR. Of course, this may not be an issue at all depending of what style of photography you like. If portability is most important, go with the G2. If you do not want to change lenses frequently, you don't like viewfinders with little information that do not show what really is in focus and/or you think you may ever want a lens longer than 90, go with the SLR.
Good luck!
Juan