1st off...find the "cattle call" section of the forum and introduce yourself.
2nd off...finding a spice that you like is almost impossible. I would suggest you just experiment with what ever you find in stores, markets, online, delis, on and on. What I'm trying to say is there is 1000's and 1000's of rubs.
You will find out that you need to than figure out what kind of wood smoke you want to go with your spice. Than you need to figure out your cooking methods, time, temp, foil, etc for each of your rubs and meat.
About the time you fall in love with a rub you'll stumble into a new one.
but I will go with "butt rub" cuz it was my first.
http://www.buttrub.com/