If you're on AT&T, you have two great Windows Phone choices available to you.  Aaron does a head to head battle between the HTC Titan II and Nokia Lumia 900, two 4G LTE options.  The Titan II is available for $199.99 and packs a 1.5 GHz single-core CPU, 4.7-inch LCD (480x800 pixels), 16-megapixel camera with 720p HD video recording, 1,730 mAh battery, front-facing camera, and Windows Phone 7.5.  Nokia's Lumia 900 is available for $99.99 and offers a 1.4 GHz single-core CPU, 4.3-inch AMOLED display with Nokia's ClearBlack technology, 8-megapixel camera with 720p HD video recording, 1,830 mAh battery, and front-facing camera.

They both offer some unique apps, but ultimately, it boils down to added features for added cost.  Which one offers the best overall bang for the buck?  Part 1 of 2.