Are their significant performance differences between higher end Campy, Shimano, Suntour, and SRAM of equivalent eras? Or is it all just a matter of opinion? I definitely steer towards the japanese groupos base on price to performance.. SRAM I really don't know much about despite having a few of their lower end bits, but they seem well made. The campy stuff that appeals to me is out of my price range (well what I'm willing to spend anyhow), so I haven't had much of a chance to try that either.. so school me on this stuff please