Why don't you just wait for a dual-core phone with a qHD screen? You know the Motorola Bionic? It has HDMI output too... and 1080p video.
http://www.engadget.com/2011/01/05/m...d-for-verizon/
I'd wait if I were you. There's a lot of crazy shit coming down the pipe, and you're going to be itching to upgrade if you buy the Thunderbolt...