FWIW fullforce I chose a TI bike because I wanted the same thing, a bike I can keep for a long time. But the reality is you never know, you could crash it out two weeks after you buy it. Sounds to me like a nice steal or TI frame is the best bet for you. Carbon frames are almost exclusively racing frames and no matter what anyone tells you here they are subject to more damage. One bad dropped chain can burn a hole in a carbon chainstay, I've seen it happen a few times in fact to one of my bikes. If you are like me and don't have winter bikes or rain bikes and don't have to fuss around cleaning the damn frame after every ride because you are afraid of salt or road grime get a TI bike