SD card no problem.
Contacts, emails, etc - use Desktop Manager to back up all your data and then there is an option to switch devices.
You should be able to use BB Swiss Army Knife or BB Master Control Program to back up 3rd party apps then restore them to your new phone.
Caution on 3rd party apps and themes: going to BB 8530 will mean that you are going from OS 4.x to OS 5.0. Your theme probably will not work and a few, but not many, of your apps may not work.