If you're on T-Mobile, are eligible for an upgrade, and are seeking a reasonably priced smartphone, this could be the dogfight for you.  The Samsung Galaxy S Blaze 4G offers a 1.5 GHz dual-core Snapdragon processor, 3.97-inch Super AMOLED display, 5-megapixel camera with 720p HD video recording, front-facing camera, 1,750 mAh battery, HSPA+ 42 Mbps connectivity, and Android 2.3 with TouchWiz 4.0.  The HTC Radar 4G is powered by a 1 GHz single-core Snapdragon processor and has a 3.8-inch display, 5-megapixel camera with 720p HD video recording, a 1,520 mAh battery, and Windows Phone 7.5 (Mango).  Which will it be, Blaze 4G or Radar 4G?  Part 1 of 2.