If you're going to do this, there's a lot to take into consideration. What do you have for recording (microphone, computer interface, etc...) and how easily do you want to deal with it. While the included GarageBand will be cheap and easy and should work with any audio interface, it's really basic.
There are new offerings from Apple, with the Logic Pro and Logic Express, but there's a learning curve on those that might not be worth it if you're just doing field recording.
What's your price range with this project, that'll help too...
DAT is durable and reliable (especially if it's in concert in the middle of a mosh pit) but it's an added expense. Again, price helps.
cpjakes