Great article - and great in theory, but I have just put a Trust copy aluminium sump on my S15 and it has reduced normal oil running temp from 180 degrees fahrenheit, to under 150 degrees fahrenheit. I have not track raced it yet with the new sump, but am positive it would even help here too.
It was a 5 minute job to install, and you don't run the risk of ever popping a fitting or hose, and lunching your engine. For non-track cars, I think the higher capacity sump is the way to go! It has fins (like a heatsink) for cooling, is internally gated to stop oil surge, and carries 1 litre more of oil. Can't go wrong! That said, oil coolers are great too, just thought I'd point out the benefit of my new acquisition, and how suprisingly well it works at cooling.