Brent,
I haven't personally used any Campmor sleeping bags or the Merrell Winterras, but I have heard nothing but good things regarding Campmor products, and quite a few folks here on VFTT have sworn by their Merrell Winterras.
Regarding the Wyoming Wear Polartec Powerstretch Powersocks, I think dense socks make more sense. I say this because anything under (or around) your foot is going to be subject to a lot of pressure, which will compress the material beneath it, and hence decrease the insulation it offers. I prefer dense weaves of wool or polyester for this reason. I don't have any personal experience with Powerstretch socks, but I can't help but think that the fabric will be compressed very easily under and around your foot.
Regarding the Katadyn Exstream Water Purifier, you may want to check out the Eddie Bauer Personal Water Filtration Bottle ($9.95 on Sierra Trading Post) as an alternative. With the Exstream, because the intake is at the bottom of the bottle, you'll have to suck the water through the filters. It might seem trivial, but I have been told there is a fair amount of resistance encountered when doing this. With the Eddie Bauer Personal Water Filtration Bottle, the intake is at the top of the bottle, which means it can be turned upside down and squeezed to get water. No sucking required. It also means that you can turn it upside down and squirt water into a pot to make dinner, rather than sucking the water through a straw and then spitting it out into the pot.
I am not familiar with the North Face Bipolar Gloves.
John