A little update on this project.
I was finally able to install a couple of my IP cameras over the weekend. Looking at the walwarts that come with the cameras, they are rated to output 5VDC at 2.5A, and the cameras require 900mA. Given that I decided NOT to use a single hi-amp PS with VR's on the camera-end. I tested the voltage after connecting one of the wallwarts to nearl 50' of CATg (using the blues and browns) and I was getting 5.19-5.22VDC consistently, the same reading I was gettting without any CAT5 in the way. I think the hi-amperage of these powersupplies result in the long run of small wire having minimal impact on them... heck, I could probably power two cameras off of one powersupply.
The technique works like a charm. I run my wire, install RJ45's on eith end, then cut a ring around the CAT5 sleave with a razor, fish out about 1" of blue & brown wires (with a 1" slit in the CAT5 sleeve), cut at the RJ45 ends (so that only the green and orange pairs have continuity all the way through) and connect my PS to one side and PS connector to the other. It makes for a very neat and tidy package - much nicer than having to put regulators on the camera end would have. The two that I made worked right the first time - no having to go back and fix anything. I think I can churn-out about 2 cameras a night, and still have time to hang out with my family and watch some TV. This will allow me to get all the cameras installed before the Au Pair gets here on Friday. My homeplug adapters that I'm going to use on a couple of the cameras should also be here by Wednesday.