I have had problems with 3T stems when I was building my UK Quantum so I ended uo with an ITM. I was very pleased with this. When I built my Quantum 2 that is in Aus, I just went with a no name as it was built to be ridden at the Tour Down Under. I smashed out 1500ks in 3 weeks on it !!!
As for the Klein meet, I won't be going. I wanted to bring a Quantum before, but Matt does not seem to realise that there are Klein road bikes !!! Oh well, I will be going through Richmond Park and into the Surrey Hills that day so you might see me