In terms of the technology I use the most, it's probably a tie between my Blackberry and my MacBook Pro laptop. That's how I communicate with the rest of the world and how I handle all the business I have to handle.
The most important thing about technology is that it can seamlessly work its way into your routine and your life.
The most I ever spent on technology is building a studio - I built one at home in Los Angeles. I can't tell you how much exactly, but the whole process is very expensive.