I commute on a XR800, which is a 2001 model IIRC. All aluminum. I'm happy with it, but it's a bit too big for me (58cm). I bought it used. I am thinking of ordering a Cross Check frameset and swapping the parts over, but if the XR800 were a 56, I would definitely keep it. You'll be able to run larger tires with the CC if that's important to you.