I am in the process of building up my new BLTC XL frame and I ended up spending way too much time trying to decide what to do for brakes as there are a lot of good products out there. I vintage race cars and good brakes are the key to doing well (amongst other things). Race cars (and motorcycles) almost always have larger more powerful brakes in the front and in that spirit I have purchase a 2011 Avid Code 4 piston front brake and an Avid Elixir X0 rear brake, with both running 185 rotors. I think this combination is going to work well as I weigh 200lbs and that equates to a lot of kinetic energy. I figure if I need more braking I can get a 203mm front rotor, or go smaller if the 4 piston is too powerful. Anyway I hope to have the bike built up in the next week or so and I will repost with my impression of the brake setup. Of course compared to my 6 year old Hayes brakes any new brake is going to work great!