Well, I guess I'm gonna endorse the Blackjack or Windows Mobile.
Ignore the fact, that my endorsement is soley weighted upon my use of the Palm Treo 700w since you dislike it. However, I have had no problems whatsoever with MY phone. It's the second Windows Mobile device I have owned and my best. My first one was the Samsung i700 Pocket PC.
To be honest with everyone, I have never experienced a single problem with any of my Windows Mobile phones that many other people seem to be having with it. Especially with some of the examples "poppe" had illustrated.
Because of my phone, I store many files through the memory within the phone itself or the optional memory card. I like the fact that I can store Excel spreadsheets to which I can work on even on the phone itself.
When you are in law school, you will be writing a lot "Briefs." Chances are you'll be using MS Word, to which you can open and use the App within the phone itself.
Then you got your usual stuff that's pretty good to use, such as camera with video, mp3, voice recorder....blah, blah, blah.
You have hundred of extra software.
Right now, the best thing I love about my Windows Mobile is the fact, that can watch DirecTV programming in my home via Slingbox Mobile software.
Well, basically I think all phones are the same. I hope I highlighted some advantages with the Windows Mobile device that might or might not sway you. It's up to you. Blackberry seems to be a very good solid phone.
Here some advice for law school:
1. Memorize all the RULES word for word
2. Prepare to be called on and grilled intensely every day.
3. Master "IRAC" <----Most important
Good luck!