I am building my first water-cooling project. So far I only got a Thermochill 120.3, and two D4 pumps. I am looking for a good cpu block to go with. I have been browsing around and narrow down to three blocks and one of them is Dtek whitewater with aluminum top. My concern is that by mixing the aluminum in my loop I would get those nasty "battery effect" corrosion in the long run even though it is anodized. Is this something I should be worried about? the other two choices are G4 or the silver G5. But I want to complete this project soon I might not want to wait that long. Do you guys have any other recommendation? Please help!