OP If you haven't already bought a fan controller, definitely check out the Sunbeamteach Rheosmart controller. It'll use PWM from your motherboard (of course, only applicable if your mobo supports PWM), but that way you don't even have to futz with speeds to match temperature and whatever else... it does it for you.
Don't worry about CFM while you're idling. I've got el-cheapo yate-loon 2200rpm fans on my radiator, and at idle they're down to 20% and don't need to speed up (even though it's cooling OCed CPU and GPU), and when they're at load, they still only hit 75% speed keeping the temps on my CPU below 60c, which for an intel processor is more than comfortable. It's the magic of a HWlabs GTX360. I'm LOVING mine.
I wouldn't bother with chipset coolers though honestly. It's usually more restriction for the total loop and doesn't bring much benefit. It'll definitely be like night and day for your GPU though. I tried, just to see how it would go, running eyefinity in Civ5 with my 6950 with stock HSF, and temps easily pushed 79c core and 85c vram with the stock fan profile (loud and annoying at that point). With watercooling, it's down to 40c core and 63c vram under an even higher overclock (6970 speeds and unlock), and my fans don't speed up past 75%, so they're still not that loud at all, and I imagine if I get 38mm thick fans on the radiator, it'll be even quieter.