I went from Alpine to Pioneer, and I was the same way. Alpine HU is all I have ever had, because they were the best... Nowadays, the Pioneer is hard to beat for less than half odf what the Alpine the cost and way better graphics. I believe mine is the 4500 DD, you can use apps from your phone on the radio, like motionX-GPS and have NAV without buying a NAV HU. Saving about $400.
All the iphone integration is what I really like, as soon as I turn the truck on, it syncs all my contacts, ipod music, and pandora from my phone. Then I can control them all without hooking my phone to anything. I bought the cord, but havent used it twice in a few months.