What is drawing you to the wireless version vs wired?
The most common reason I hear is that people don't want to run Ethernet cable from their NVR location out to each camera. I challenge back, you still need to power the cameras so what will it take to put a 120VAC outlet at each location? Surely CAT5 has to be easier, (and doesn't require an electrician either).
Regardless, wireless systems certainly have their place but be aware that their resolution is limited to 1080P resolution, (1920x1080), The wired 4MP version offers 2560x1440 and the 5MP versions are 2560x1920, (that's nearly double the view area and 2.5X the resolution!).
Having recently upgraded from 4MP cams to 5MP, I can attest to how much of a difference resolution makes. 4MP would be the minimum I would ever consider.