I have just come back to WoW and leveled my prot warrior to 100 and decided to level my rogue when not on my warrior. I upgraded all of my leather agility heirlooms to 100 and started leveling my rogue - he is 99 now and will be 100 today. The heirlooms made it crazy fast.
I have been leveling as combat but I tried to do some research to see what the preferred raiding spec is and found that it seems to be combat/subtlety depending on the nature of the fight? Is that correct? If so, for the people who do this, do you have two sets of gear with the right secondary stats for each spec, or do you optimize for one of them and live with it for the other?