I would stay away from the polarflo blocks in general in terms of overall quality and cooling performance. Check out the Whitewater from Dtek (
www.dtekcustoms.com) or the RBX from Dangerden (
www.dangerden.com). Both easilly out perform the polarflo and are of top quality. If you are still interested in chipset cooling, Dangerden just came out with a nice Maze inspired chipset block that would work very well for you. Check it out. I don't have any experience with the polarflo GPU block or mounting on an AIW, so I can't help you much there...
Dtek and Dangerden also sell versions of nice heatercores in the JR-120 from Dtek and the single and dual 120mm heatercores from dangerden. Any one of these heatercores would be a great fit for that pump and the whitewater or RBX block. Where were you planning on putting the radiator in that case? It looks as if things are going to get mighty cramped in there...
As for the Zerex, yes the super coolant is the most used, but it does have the nasty habit of turning your water a nice shade of purple, even for a capful in a gallon of distilled water. If you plan on using that visible dye, then the supercoolant isnt for you. I don't know how well the super protector is, but I have rarely seen it used so maybe its not the best. Water wetter is a very popular product that accomplishes the same thing as the zerex, plus it works well with dyes because it adds much less tint to your water. Keep in mind that you only need a couple of ounces of additive per GALLON of water, so mix carefully and dont go dumping a bunch of whatever you decide to use in your loop.
Other than that good luck and happy cooling!
-OMP