I'm about to pull the trigger on a Racer-X 80 or 100. A little background about myself..I'm an avid mtn biker that rides 2-3 times a week regardless of weather and race Sport 5-6 times a year. I currently ride a 2002 S-Works FSR and am looking for a racier upgrade. I reeeaaaallllly want to purchase a RX 100, but am concerned about the effective top tube length of 22.7" (my current ride is 21.5" with a 110mm stem and straight seat post). Looks like the RX 80 small is a better fit (especially if I shorten my F100RLT to 90mm), but i would prefer the more travel. Also, the custom ti option and more cost doesn't appeal to me... Any feedback with respect to sizing/personal experience is greatly appreciated.