I didn't even think about durability, on my Scott I had to walk out one day because the seat post broke. Remembering that I guess durability would be number one for me. Since handlebars can often be cut but not added back I may try something wider. I am pretty narrow shouldered so I think 660 might be okay. Anything wider feels odd, I test rode a bike with something wider and I felt spread out. I know the stem length on my Fisher should stay, I love the fit length wise of my bike. I also like the riser bars, even though it is all I have rode I just know I like that position and why mess with a good thing?