DevonTHINK, how has it helped you?

I've asked y'all on this board for buying advice in the past, and I'm very happy I followed it. (OOP is awesome, I use it everyday).

My current quandary is DevonTHINK Pro. I wondering if I should acquire this as I become a graduate student in the Fall. It's very pricey though, so I was hoping that you folks could throw in your two cents about this program and it's alternatives. I looking at Mori in particular as a potential middle-ground.

What I'm particularly curious about is smart folders. Does DevonTHINK Pro have a smart-folder like ability? I find that strictly grouping data with one label limits the amount of connectivity, and I confused by the way DevonTHINK uses folders.

I, for example, use Mail.app in the following way and love it. All archived mail goes into a folder called "archive" Mail is tagged with MailTags and Smart Folders help to parse them all out. It's fast, easy, and highly adaptive. Messages can exist in multiple contexts. I'm curious if I could get DevonTHINK to work in a similar fashion.

Thanks!

-Casey