who's not keeping it real? Plenty of people here in these forums run dual radiators. The BIX2s are in fact smaller than what I use

That's my solution to "I want water temps as close to room temp as possible while using quiet fans".
Anyway you're right this isn't a commonly sold configuration by many mfgrs (swiftech does dual bi micros though). Perhaps defining a kit as being a package sold as a complete wc solution by the mfgr would be a start?
Swiftech, Koolance, Thermaltaco are only complete wc kits from US I can think of atm. Am I missing anyone?