I'd suggest going into a bike shop that has a "butt-o-meter" or simliar measuring device - its not as embarassing as it sounds - you sit on it and the indentations that your sit bones leave indicate the saddle width you need. A big wide soft comfort saddle might look appealing, but for anything more than a short jaunt around town its likely to not be so nice. Better to get measured and get a saddle that fits well.
Gel covers are useless... they usually cause more irritation than they solve.