retnav94, If the CAAD5 is in good condition and it fits it'll be a good buy, IMHO. A good bike is a good bike, regardless of age and I have a 2X9 DA on one of my bikes and have never felt the need for a 10+S rear. Oh yeah, that DA is on an outdated CAAD3 frame and I have no compelling urge to replace it either.

Brad