Spacemilk,
1. Awesome name, I totally dig it.
2. The corsair H100 is just a CPU cooler, it's not a complete system liquid cooling kit.
3. Your videocards if running at factory speeds will be completely fine with the built-in vaporchill cooling that's on the 5xx-series cards. there's no need to cool your videocards with any aftermarket cooling unless your case does not dissipate heat well, or if you plan to OC the heck out of the videocards.