This is probably a silly question, but I just upgraded my Inspire 1 with the X5 camera and my question is do I download the latest firmware for the 'Inspire 1' or the 'Inspire Pro'?  Would the Inspire 1 be considered a Pro version now?

X5 = Pro. Just make sure you use the X5 and not the X5R. But, take it from experience. Use v1.4.0.70 and not the latest version, v1.8.1.00
See: http://forum.dji.com/thread-52361-1-1.html for reasons.