brake rotors

What is everybody's take on power slotted and cross-drilled rotors? Seems like my rotors warp within 6 months of installing them and I either have to turn them or get new ones. See my plan is to get some new calipers and have them painted and powder coated if it doesnt cost me to much.
I was thinking about getting the power slotted rotors and the brake pads to go with them.
Where is a good place to order these from without breaking the bank. lol?

chell-