It's an interesting case. I see your conundrum. PSU heat blown out the bottom-front to be sucked in by a conventional front intake directly above it.
I see no problem leaving the front F8 in an exhaust configuration. If it's bothering you with noise, take the front F8 out. Your system with its giant side intake and dual real exhausts, cpu cooler and gpu fan(s) will be fine by themselves. You won't be making much heat with that setup. But if the front F8 isn't bothering you noise-wise, leave it in there since it will help to keep the system from possibly sucking the PSU exhaust and will keep that HDD cool.
Either way, don't worry too much about staying conventional, that case is already pretty non-conventional. It'd be great in the Winter for my feet! ; )
Larkspur - I agree with your points. My view is that the flow is balanced and the front fan deals with psu/hdd heat and two rears with cpu. the GPU may not have direct exhaust but the model i plan on getting pushes air out the PCI slot at the back.
I left it running for 2 hours this morning just in bios. the cpu (turbo'd to 3.5) sat at 43 and the case at 24.
i realise cpu may drop once in windows etc but seems ok, and case is very low since the room was about 18 degrees.
i will try it with fans off and see if it makes a difference to temps.