The Z3 is some £150 more expensive than the z3c! I can get a Z2 for £299 however. I just thought the camera on the z3c was a little pants to be honest but I have a feeling I didn't give it enough of a chance!
To be honest there's minimal difference between the Z2 and Z3 I think that the screen tech is slightly improved and Sony put in a 801AC SD instead of using the 801AB SD. Battery however on the Z2 is 100mAh more than the Z3. It all depends on the size of the phone you are looking for and what you'd use it for.
The camera is excellent Mate I don't think you spent enough time with it. The manual mode is superb.