You're arguing the wrong point as to Haswell. The TDP is still higher then the Ivy Bridge even if the overall system demand is reduced by moving the power transistors/control onto the CPU die. I think the 89TDP versus 77TDP says it all and with the planned under clock/volt it wont make much of a difference anyhow.
That's 84W vs 77W and as you say it matters little. It just seems a little strange that you seem to value low CPU power consumption higher than low system power consumption, especially when more of the system fits on the CPU and that you will underclock that CPU, making the small TDP difference even less of an issue.
On your Hyper212 concerns, granted, it will be very tight but after watching the install Video on Youtube, I feel confident that the Coolermaster Reply I have is correct. There may only be 5-15mm clearance between the HSF and PSU but that's plenty. I've seen systems that had actual contact between an HSF and other components such as RAM. In this case, the case has an excellent PSU mount that can be easily replaced with a slightly deeper unit to gain clearance so it doesn't appear to be a problem. Love the PSU bracket setup as it's the only thing making this possible.
It should be tight indeed, as max CPU cooler height according to the case specifications is 65 mm and the Hyper 212 is 159 mm tall. Or do you mean that there's a PSU mount available that will let the PSU stick out so much in the back that the HSF will fit beside it? Can you link to that video?