I decided to move the old website from TextPattern to WordPress. I was getting tired of the TXP interface and lack of plugins (in comparison), and was waiting for what seemed like years for TXP 5 to arrive. However, the wait has ended, and I am giving WordPress a shot. Converting from TextPattern to WordPress was not as bad as I expected, but it did take some effort.
In case you are thinking about doing the same thing, here is a brief outline of the conversion.