I have been using UltraEdit since coming to my new job back in November, and it is *wonderful*. Code folding, syntax highlighting, tons of features, built in FTP, etc.
I used to use Notepad++ and Araneae, and still use them from time to time, but sprung for a license of UE for myself after getting hooked.
They have a 45 day trial to test it out and get addicted.

I think the licenses are relatively cheap (<$50).<