The only one I'd add without knowing more about your goal of buying those books is "Refactoring" by Martin Fowler.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
Head First Patterns is also an excellent choice, unless your people don't have a sense of humour
Joined: Nov 27, 2002
I can also highly recommend the new "Domain Driven Design - Tackling Complexity in the Heart of Software" by Eric Evans. I got it yesterday and haven't been able to put it down. The book's focus is on the techniques and processes used to develop a rich domain model. It emphasizes maintaining a close tie between the domain model and its implementation in code.