I personally have always been impressed by our Epsilon Phi chapters website.
University of Florida KKG It looks professional, and information is easy to find. (And just gotta put a plug for our big sister chapter!)
Oh, and something I've always liked- if you do a history section, try to put some chapter history on there. It irritates me when the history section is just the blurb from the national's website and nothing else! Good luck on the website.