My SFF i5 Box - Help with cooling, tweaking, adding finishing touches

This post got ridiculously long so I decided to put everything not 100% necessary to understanding my problem in a spoiler; click to read the whole thing or for reference to parts and such, thanks.

Unnecessary personal commentary on the components below!

Cooling - Help? I knew this was going to be the major downside of a SFF build, but I'm convinced I can overcome it. I had originally not intended to do any overclocking, but reading about the 750s potential got me too excited to resist. I'm not trying to set any records here, I'd just like to run my ram at its intended speed, and maybe get a stable 3.6Ghz without burning up my new processor. I'm aware that as of right now options for 1156 coolers are limited, but they're trickling out and, more importantly, so are adapter brackets. When it comes to cooling I've always gone near overkill, and I'd like to keep that up.

As it is, my case is actually pretty empty, but airflow still isn't great. The case has room for an 80mm intake up front, where I put a Scythe Kama Flow, but there is not much space for it to draw in air, and the air that it does pass is at least half obstructed by the stiff 24-pin connector on the motherboard. I replaced the stock exhaust with one of Cooler Master's newer 120mm fans that claims 90CFM at 19dBa.

The biggest problem overall is really the fact that as of yet I'm unable to figure out how to install a serious CPU cooler, a task that will almost definitely involve modding the case. With the current setup I have about 130mm (possibly 135mm) in height before hitting the PSU, and about 45mm width before hitting the support rails. I'm either going to need a rather short tower, or one of the "flower"/circular style heatsinks like the previously mentioned Zalman CNPS8700.

I've also looked into some of the PCI exhaust fans, as I have no intention of using the additional slots, but I haven't been able to find any decent write-ups on their effectiveness. I also was thinking that there may be some way to make use of the two empty 5.25" drive bays (no intention of adding an optical drive) but haven't been able to come with anything.

So to wrap it up, let me say once again, I don't expect miracles. I know cooling is always going to be tough in an SFF build, but with that as a given, what would you all suggest doing here? Budget isn't really that important anymore as long as I can justify the expense, so throw any you've got at me. Thanks for reading such a ridiculously long post; here are some pictures to help you get a better idea of my present condition (I have not even started with my cable management, I know it looks terrible, no need to comment.)

Full shot to give an idea of overall size:


Top (those hideous green screws were the only rubber ones I could get):




Open area/drive bays:




Left side: