Yeah, I'd found a link to them in another post and poked around abit.
They look like a fine res actually, and I like it setup the way they have it pictured (in the case) on their page. Outlet to the pump on bottom, inlet into the top...keeps the bubbles separated. With a pump that fast, you don't want to place them directly accross from one another, as bubbles might take longer to separate out from the waterstream.
What I'd said about the size...if there's enough tubing,radiator,waterblock volume in your setup, the larger one maight be easier to use, since you'd have to fill the res, then start/stop the pump a few times to fill the tubes up to the point that you can run the pump without going dry.
Other than the initial fill-up, there's not much difference between how they'd perform.
And never use straight alcohol to clean or fill an acrylic/poly res, it doesn't like the glue joints. Mixed with water like in Windex or your cooling fluid, it should be okay.