Need advice on my new bike purchase. I can't afford a 5-6 k mistake. I have a history of back issues; neck, thoracic, and lumbar. I do 70.3's, and want a shot at 140. at 56 years, comfort is key, but I'm already slowish, and looking to pick up any available "free speed." I am aware that this will come mostly from my position on the bike. At 5'7", 190 lbs, (big chest/arms/powerlifter build) I can hold a 15mph pace on my 10yr old madone with aerobars, and that's working hard. LBS PLEADING with me to NOT buy a speedconcept from them, as after their fitting, I would require the very upper limit of the bike's stack range. Also, we live in hill country, and LBS says I will not like the SC when I'm not racing on a tri course. They are pushing the domane, or the new madone 9.0; either with flipped seatpost, and applying my aerobars. geez. I get a higher but narrower position on the non-aero domane or I am buying a second "clipon bike" with the madone (but a great aero frame). Do I steer away from the domane due to the aero penalty of the frame? DOES THAT EVEN MATTER for my type of rider? (my goal is always to finish, and be able to walk away). Do I go with the uber-aero new madone 9.0, and know that I will get a tighter hip angle when in aerobars? Or ignore LBS advice, go speedconcept, and work on flexibility (which I always have to do anyway). "I've seen too many riders on roadbikes not make the cutoff, who, had they been on a properly-fitted tribike, would have been fine," says a tricoach online. Just left hospital with a thoracic spine issue, so you can understand my concern. I would appreciate your thoughts.