What type of riding do you plan on doing with this bike ? The Kilo TT has track geo and would be a good choice if you plan on riding / racing at the Superdrome with it's steep banking. The aluminum Langster is a great road bike with slack geo and a low bottom bracket, but would be a poor choice for the track. The Langster is a better quality bike than the Kilo TT, which is why it costs more; that's usually the way things work.