[bmelton]

What deficiencies does Wordpress have? How is it not capable enough? Knowing whether it won't perform well under the kind of load your audience generates leads to an entirely different answer than knowing that it is limited in some other way.

If Wordpress is lacking in extensibility, then my guess is you'd be better off with something like Django, which isn't a blog at all, but could easily be converted into one -- or you could start with an existing, minimalist Django blog package and extend it.

If Wordpress is simply lacking features you need though, that's a different conversation, as it's the most likely to get those feature in the future, and/or possibly the cheapest to have those extensions developed.