Depends on the power required by your setup. The TK Power PSU is rated at 300W, and if you drain more than 200W i'm quite sure it needs proper cooling.
RSG Electronics make a seemingly sturdier PSU, but you'll have to pay the price ($300 + shipping from Germany).
Deltatronics make a 360W PSU with active PFC (ie top notch), and it's a real looker. However it's a German shop so you'll have to pay for some shipping...
As for "cooling" those PSUs (if used near the power limit) it's quite easy for the TK Power and the RSG Elec. The MOSFETs are on a flat "rail" which is on the side of the PSU, acting as a "heatsink". Just stick a WB on it and it's watercooled...
The Deltatronics one will require a bit of modding (the heatsink has fins) but i'm sure it's possible.
I'll admit i've not searched too much, once i found the 2 German suppliers i stopped. I'll get the Deltatronics. With a bit of searching you might be able to find some in the US... Hint: they are usually found in industrial and embarked systems, like aircraft or hazardous environment machinery...
Oh and thay work well indeed, they're designed for critical applications, and have higher quality components - thus the lesser heat produced... You wouldnt want your aircraft navigation and control systems go down with a crappy PSU heh ?
As for HDD you can go further, with suspension + insulation. If you're afraid of high temps get a HDD block (DTek has a copper one) and you're settled
PS: good luck on your project, we have the same goals...