HTC has officially unveiled the HTC Desire 830 – a competitively prices mid-range smartphone with an impressive spec list. The Desire 830 comes equipped with a 5.5-inch Full HD display, MediaTek Helio X10 processor, 3GB of RAM, 32GB of internal storage, microSD expansion slot, 13 megapixel main camera, 4 UltraPixel front-facing camera and an extremely generous 2,800 mAh…