I havnt played my rogue since level 70, it was an alt i rolled but i can tell you a few things from my experience -
Rogues are awesome - once you hit max level
Super boring class to level - the fun doesnt start till end game really
Gnome Rogues are possibly the most fun, they are so small and they look cool. Little male gnome rogues look so sneaky,
and i know horde hate gnomes, which makes it all the more satisfying when you gank people.
As for your questions - go to elitist jerks and read up there imo if you want to min/max your toon.
I too am on a break from WoW atm, simply dont like WotLK really, but i will be back for Cataclysm where i will roll an elemental goblin. I am going to faction change my gnome rogue to goblin rogue too and use it as an alt.
Good choice of char, but just remember that levelling a rogue is the most boring class to level (at least it was for me anyway), but once you hit max level it all becomes very fun indeed