how comfortable do you want to get?

whats your budget?

If you wanted super comfortability you could buy a gel seat, then put a gel seat covers over the seat itself.

For wrist comfortability you can get gel-inserted handlebars, then buy really thick cycling gloves.

those are your main 2 points of contact that associate with comfortability.

Although carbon fiber generally takes in more shock, generally it doesn't effect the heavier riders as much as the light weights (<150 lbs).