Take a look at the Yongnuo YN565EX. It's more powerful than the 430 and will cost less. You can use it in wireless ETTL mode if you have a way to trigger it (I use the wireless capability of my 7D) as well as full manual of course. You can also control it completely within the cameras menu.
The only problem with it is that there is no high speed sync for shots outdoors if you intend on lighting a subject while retaining good quality of a bright background.
I bought one and received it the other day. It's completely transformed the pictures I'm getting.