I wouldn't buy anything until you get training.
If you go with the cheetahs, it's really a good idea to learn how to powder polish. There may be times when you can't get the polish back on the floor with just the cheetahs / monkeys. Powder polish will help you there. I personally have not been able to do a full restoration with just the cheetahs/ monkeys. Apparantley my pads are contaminated but I do use a few of them once in a while. I don't discount this system though, I would just like to see someone get consistent results with them.
The cheetahs are basically an abrasive like diamond pads. Diamond pads to me are more consistent because I don't have to be so meticulous about rinsing after each step. BTW, my usual restoration would normally consists of 3 steps, 2 diamond grits and powder polish. I may throw in a 4th step (buff with the 11k monkey).
You won't go wrong with the training provided by Ted and Cameron as well. Ted's been restoring since the 80's and knows his stuff.
Albert