For me, my CAAD9 has SRAM Rival 10-speed and I really like it, having test ridden several 105 and Ultegra built bikes over the last couple of years. I prefer SRAM. I'm going to keep the CAAD9 until the frame brakes but I'm going to start racing next year and will be using it as my race bike. I also like endurance riding (but not full on touring) so I will be building up a bike specifically for centuries, double centuries and maybe eventually "credit card" touring on weekends. Since I like SRAM and for an endurance type ride, the latest, lightest, greatest group isn't necessary, I've decided to do a 10-speed Rival build, using a wifli RD for greater cassette range over the short cage setup on my CAAD9. Since that's now "outdated", it will also allow me to save quite a bit of money over building with 11-speed Rival or Force. So now, it's just a matter of choosing my frame and for what I'm planning, steel makes sense, but since I'm not doing loaded touring, a steel fork isn't necessary, so steel frame with carbon fork, it is. I've looked at off the rack frames made overseas - Soma, Surly, and a couple of others, but settled on a Gunnar Sport for US made custom sizing (available). I'm hoping to keep the total build around $2000, but won't skimp on wheels to do it.