I'm not sure the Naga is more expensive. On Amazon they were pretty on par.
I tried out the Naga Epic first and, while I enjoyed the way it felt, the mouse is fairly light and has a "cheap" plastic feel. The number pad is a great idea, but it was harder to learn for me than the four way hat switch.
As to wireless versus wired, I've tried both for long periods of time and found that the effect of a wireless mouse is fairly inconsequential IF the wired mouse has a good quality braided cord. If the wire is too stiff, then it is a problem, but otherwise I haven't had the need for the wireless aspect. That is a highly subjective topic and some people flat out refuse to use wireless mice because of the threat of latency or batteries cutting out at a key moment. That is a little silly, latency in modern gaming mice is hardly a problem and one should plan ahead when it comes to battery power. The only caveat is that some wireless mice can get interference from other wireless devices and cut out. That is a serious problem, but one you will likely not be able to predict until you try the mouse out.
Where the naga has the slight upper hand is in its programming utility and in its out-of-the-box comfort level. The naga will feel good almost immediately, whereas the Cyborg requires "learning" and adjusting to get the proper configuration for your hand. Once you get there, the Cyborg has the potential to be more comfortable, but it is a flat-style mouse and wide mouse (compared to the Naga's arched and thing body), so that may throw some people. The naga is also able to be used for any game with a number pad with no programming, as the keys on the side automatically bind to the numbers on the keyboard. Now you may want to further refine these in the utility, but you can pretty much jump straight into several games with no extra work - something you can't do with the Cyborg (the buttons will do nothing until programmed).