I appreciate Nick volunteering the designer of Motorola's website (which Motorola site?) - but I think it's only fair that he realizes the economic realities of a club of volunteers! This will be largely a labour of love I would imagine! Mind you... if he helped build your Sumo..

Don't get me wrong - I'll certainly appreciate the help as long as he's comfortable knocking around MySQL databases or building around this CMS (since we'll need one or the other!).
If we are looking at design, then if we are going to get a decent design, I would prefer to throw the look and feel into a competition site that I have used many times, which has created sites like my personal blog at
www.dixonjones.com and
http://99designs.com/web-design/contests/web-design-established-solicitors-33475/entries/51 because we get 50 designs from around the world and as a group we just get to pick one instead of mission creep.
Blending a design into a content management system with databases, pictures and all the rest of it is not easy for me though. I own a company that could do it - but never for the money, so we need to use an opensource or inexpensive cms for the backbone whether you like it or not.
Separate point - can people list the urls sites they are referring to? It's not always clear which ones you mean.