I have John Lyons Conditioned Response Training Manual...for Ground Control. I love this, and if you're in need of a step by step,easy to understand and do program this one is great. It helps you develop a plan, the steps and where you need to start with YOUR horse. These are pretty costly. I got mine (an older version but it's perfect) along with all his Communicating with Cue's: series of hard back books, 6 VHS tapes on training, and years worth of his magazines as a goup lot on Ebay
for 110.00. The deals are out there but you have to look and wait and Get lucky!
I also have Clinton Andersons videos on round pen work and ground control. These are great! If you're at this point in training and you want something easy to understand and do and something that works pretty quickly with good results these are great for this. You can really follow it and not get confused.
Parelli I like as well but I think there's alot to learn here and takes time because it's less of what people are used to doing but it is fun to do with your horse and you get good results. Some of their stuff is higher priced too.
Hope this helps some and hope you and your horse enjoy the journey!