New phone?

Hello all!!

I currently have a aging iPhone 3gs and would love to get a new phone sometime soon. I recently saw a Nokia Lumia 900 for sale and was wondering what you all thought of getting something like that? As a background of my tech gear I have a Nexus 7 16gb and a laptop that usually stays on ubuntu, but it also has windows 8 on it. Also I am currently on a AT&T go phone plan. Would love to here what you all think, thanks in advance!!

David Landis Jr.