Depends what you want to use them for. If it's just for sig-making/ site layout making/basic gfx, then just use Photoshop. Illustrator is more for vectoring, if you don't know what that is, then don't bother with Illustrator.
The other Adobe programs all serve different purposes. Btw, with that kind of comp stats.... using photoshop will be a slow and painful process for you.