I am also riding the Orbea Onix, but for probably different reasons. First of all, I'm a two hundred pounder, so the weight difference between the Onix and Orca is not a big issue for me. I really didn't want a real superlight bike anyway, considering my weight, the sometimes poor condition of the roads I ride, etc., I just felt like I wanted a little more beef under me. Plus the additional cost was also a factor. Besides that, the Onix was as stiff as anything I would want or need, anyway. And I have to be realistic about my riding goals and ability. I'm not exactly Tour DeFrance material, and at 55 years old, I never will be. I use riding to compliment my workout routine, I usually ride at least twice a week. I typically do a 50 miler every Sunday with the boys from my LBS, and I get out on my own after work a couple of nights a week and do some thirty milers. Plus I get out and do a handful of the charity sponsered rides every year. The Opal is pretty much a competition level bike, and I don't need that for the same reason I don't need a pair of race skis. On the other hand, the Orca is supposed to be the cadillac of the Orbea line, their best blend of comfort and performance. They say the ride is unsurpassed, which would make it my choice if I was thinking about upgrading. I also skied with a friend last year who used to be a competitive cyclist, and still loggs an impressive amount of miles, who had ridden the Orca, and planned on buying one for himself, and he is about your size and age, FWIW. My advice would be the same as if I was recommending a pair of skis to someone. Be honest with yourself about your ability, your needs and goals before you lay your money down. Good luck.