Portfolio designs look great, however the main design site looks like a template and really doesn't even make me want to check the portfolio or other pages. There's also really no need for such a huge header.
I personally think that
http://www.dickmansdesign.com
and
http://www.webinc.com
do the best job showing off their work; good navigation, good layouts and presentation.
I of course haven't seen every design company website, so if you guys feel yours is top-calibre then please do post it here.
Matt