For those of you who already own an Iphone and are planning on upgrading with the iPhone 4S, how are you planning on starting with your new phone? I'm thinking of just using the "backup" of my current phone (3GS), and getting right back to business, with all my contacts, settings, apps, etc intact. However, doing so *may* have the downside of potentially slowing down the new phone (I know, it's blazing fast, but still would like to start out on the right foot). Other options is to re-build from the ground up as a whole new phone and try to get it all back to where I started by manually adding bits and pieces, etc. Thoughts?