I know that SAP system maintainers/programmers earn a lot of money, in many instances with salaries of $200k+. But please, don't specialize in something solely for the money. Things like pentesting and reverse engineering are fields that hire people with extraordinary passion; it's hard to make a lot of money just trying specialize. I can speak on this topic, as I work in information security.

If you dream of making an iPhone app that people use every day, go that route. If you want to hack into the Fortune 100, get into information assurance. Want to build vast networks, become a network engineer.

The point is that any of these things can be lucrative, but they are competitive fields with no guarantees. Follow your heart, work hard and hopefully the riches will follow!

I agree with the other comments; do what you are most passionate about. I found the following for you, not sure if its useful. There's a downloadable PDF but you have to supply some details. Looks pretty good though. http://www.roberthalftechnology.com/SalaryCenter

The best field is the one you are most happy in. It is much easier to find a great job if you are extremely satisfied with what you do, because then you excel at it.

high frequency trading C++ programmers at investment banks. A senior level position with 3-4 years experience can get 200-300K