Hey everyone, I'm a mountain biker looking to get into racing road bikes. I used to road race sport bikes so this short course crit racing seems to be right up my alley. I'm looking to purchase my first road bike which I hope to start racing with sometime this summer/fall. I am very fond of my LBS that I go to for mountain bike related stuff so I plan to purchase through them. I rode a few bikes and brought my decision down an Allez Race 105 or Tarmac sport. Components are nearly identical so it really comes down to carbon or aluminum. Since I'm new to this sport I'm unsure if I should spring the extra $400 or so for carbon. I understand it is stiffer and lighter(how much exactly...looks like 1 lb?), but at 155 lbs is 1 lb of bike weight going to make that much of a difference? Any insight on my decision would be greatly appreciated. Also any other tips/info on getting into racing would be greatly appreciated.