We have 2 4s' with different apple IDs and the our iMac with its own ID as well. We want to be able to transfer music from our iMac to our iPhones without losing the music we already have on our iPhones. Is this possible? We keep getting a message that says "the iPhone is synced with...

Darkstar have you used garmin or Tom Tom? Ratings are the same in the app store, but garmin is cheaper

I use Waze. It doesn't IMO know as many routes as google maps on sprint. I'm looking at biting the bullet and getting garmin or Tom Tom.