8320. I'll start by saying I have the 8830 for Verizon and I love it.
8320: I have movies, music, pictures on my phone. With the Opera web browser, I can browse the "full" internet like the iPhone. I use google maps, and there is even a facebook application. This phone has wifi, for quick internet browsing when its available. It also has Blackberry's push e-mail, so e-mails are delivered quickly and you don't use data to check if you have new e-mails; they are "pushed" to your device. The Curve also has a great 2 megapixel camera and a 3.5mm headphone jack so you can plug in regular iPod headphones. My Verizon Blackberry doesn't come with all the IMing clients that I'm sure the T-Mobile version does, so for my 8830 I use Jivetalk for AIM. Its great, and you can have custom names (Bob and not bballkid342 or what have you), and you can send a receive files just like on a computer.
Q: The Q has t has a 2.5mm headphone jack that you need an adapter for, and "pull" e-mail. Also, Windows Mobile is very slow. Go to you T-Mobile store and try jumping from application to application on the Q and then on the 8320- you'll only get loading screens with the Q. The only advantage the Q has is that it has 3G, but AT&T's 3G network is very poor. If 3G is that important to you, you should look into switching to Verizon. The Q does have the ability to edit Word documents built in, and the Blackberry can only read them. However, you can copy and paste them into a memo pad document on the Blackberry and edit them, or purchase software that allows you to do so.
Hope this was helpful. E-mail me if you have more questions.
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I knew this seemed familiar: http://answers.yahoo.com/question/index;_ylt=AsA18OPuGp2nSAq7HzmMx.Tsy6IX;_ylv=3?qid =20071227141913AAJo4pz
After you ask a question, you should choose "best answer"

. Its sorta yahoo answers etiquette.