I'm deeply conflicted between a penchant for objectivity and recent deep-seated rage at Sunbeam-Tech. Objectivity wins: the Tuniq proves to be a close runner-up with the ThermalRight Ultra-120-Extreme cooler. But the TR cooler still trumps it for thermal performance at chosen fan rpms. On the noise-level angle, I think you're stuck with what Sunbeam provides, although you might be able to make a DIY replacement. With the TR cooler, you can at least shop around and find the quietest fan with the greatest throughput CFM.
That being said -- per specs posted at Sunbeam other than the dimensions of the Tuniq, I'm currently following a policy that I do NOT BELIEVE ANYTHING THEY SAY until they slap down the subcontractor who made the recent shipments of the Theta-101 fan controller marketed in the US, and force the contractor to swallow the costs of making good to buyers of the Theta-101 here in the states. And whatever their lingering memory about the Japanese "Rape of Nanking," Sunbeam should be following Japanese QC principles, and that includes inspecting and testing product -- whether they made it or the sub-contractor made it.
And THAT being said, I suggest you get a plastic ruler, pull off the side-panel to the case, and make some measurements to a tenth of a centimeter accuracy. Check the manufacturer (Argggghhhh!!!) site for the Tuniq, or any resellers who post specs for it, and get the size and dimensions -- they're always shown in metric, and occasionally in both metric and inches.
The mobo pan PROBABLY uses 1/4" standoffs, the mobo pan is probably 1/16"-thick sheet-steel or 1/8"-thick aluminum offset from the right side of the case by so many fractions of an inch, the motherboard PCB is probably 2mm thick, and you need to measure the height from the upper PCB surface to the processor cap. From there you'd not have a difficult time with applying the Tuniq height specification (and width or depth as well, I'd think) to finding out whether or not it would fit -- before you buy it.