I might be making a mistake posting here, but I'm looking to get my first road bike. Looking for a more aggressive type frame or somewhere in the middle of the spectrum between aggressive and relaxed. Budget about $1000 but if justified will spend more. Open to Tiagra or 105 parts. Options seem to be CAAD8 (Tiagra or 105) = $950/$1100, CAAD9 (Tiagra) = $1000, CAAD10 105 = $1300. There is probably wiggle room in price on CAAD8 and CAAD9 but not CAAD10. While it may obvious to some to get the CAAD10, I'm wondering if I should get the CAAD9 while I try out the sport, and if I get better and get the upgrade bug, I could keep the frame and swap out parts 2-3 years later when the current top groupsets will be cheaper.