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I'll just reiterate what has been said already: A change of theme, a bit of a reorganisation of your page layout and you'll be sweet. Nothing wrong with the theme you have, but when you've seen a lot of sites with variations of that theme, it does get a bit tired. That could be another way of persuading your committe, if you need to - ask the other guy to completely change the "look" of the site, and change it back again in a few minutes. Bet he can't do it. (of course, you would have another theme prepared to show them how easy it is with Xoops)
Also, you said he mentioned using HTML instead of PHP. That site he did has all file extensions of .php?