Can anyone point me in the right direction to find out what choices I have when migrating? Such as pop email (accounts and messages), iPhoto library, iTunes, etc-?
I guess I am wondering how detailed I can get when I migrate.
NOTE: This explanation assumes that you're comfortable with the term "User folder" (and understand, for example, that your User folder has a library folder that's different from the System's library folder... though you should probably avoid copying over either of those in this case)
You can probably safely copy over the Pictures folder and the Music folder from your user folder.
Documents folder should be fine too.
You could really move over all the folders in your user folder EXCEPT for your user's Library folder and not run into any issues.
Not sure about your mail (off the top of my head)... you'd probably have to pull that out of your user's Library. All my email accounts are IMAP, not POP, so all messages are also stored on the server, so I'll just let them all redownload over night or something.
I'm doing the same thing as you in a couple of weeks.
EDIT: Also, I'd recommend only installing applications as they become necessary... one at a time. Don't copy all of them over right away. I'm going to bring over some of the huge ones that are self-contained and then, as I need them, redownload the others. That way I can more easily isolate a problem application than if I put everything on the new system at once.
And for Address Book and iCal, there are "Export" options in the menus for those applications, so you can export their databases and then later reimport them in the new system.