So currently I am a Miner/ Jewelcrafter.
Mining is maxed at 450, so I have the +50 Stamina bonus.
However I was looking at Dropping Mining for Blacksmithing and powerleveling myself through it in order to make more sockets on my gear.
I just can't decide if its worth the headache.
Armory listing if your interested:
The World of Warcraft Armory