iirc Hurdy was selling his forge twintercooler a while back so ask if he still has it. 
Not selling at the moment
DomT and myself have had a few discussions about our intercoolers (yes, we a geeks and proud of it!!)
There doesn't seem to be a lot between the THS cooler and the Forge Twintercooler, in terms of price or performance.
The idea of getting a 'cooler is to reduce heat soak that saps away the power you have when the car gets hot. The further up the power tree you go, the more important it is to keep things cool. A larger 'cooler will flow more air through it, keeping the system cool and stabilising the power of the car.
The Twintercooler is easier (cheaper to fit, but a little more £££'s to buy), wheras the THS cooler is cheaper to buy, but more £££'s to fit (if not DIY).
The Volume of the THS is slightly less than the Twintercooler, but has larger pipework. Remember that it also still sits between the engine and the radiator, so loses slightly on the ambient temps around it.
The Volume of the Twintercooler and ED30 combo gives a slightly larger volume, but the pipework is a little more restrictive to flow. You get the stock ED30 cooler location as per the THS, but you do get the advantage of the Twintercooler being in front of everything and the virgin cold air draw.
HTH
