Sounds like you're a great candidate for a Tippmann 98. It's a perfect entry level marker, and the things can survive just about any form of abuse you can put it through. Many fields use them as rentals, and I have a few personally (One 4+ years old) that I've yet to change an O-Ring on. They are highly upgradable (Not quite as much as an A-5 mind you, but still pretty good), and can be found used without too much effort as well.
