Are you looking for NH videos?
I personally like Parelli because they break it down so that it's relatively easy to learn.
If you're going to buy a DVD set I would get the Level 1 disc set to start off with. It's worth the money. There are cheaper ones on the site but trust me, the Level 1 stuff explains it SOOO much better & makes it easy to follow.
If you have the cash you could also join the club. I think it's $23 a month or $200 for the year. They send you free DVDs & magazines & you get a big discount on all the stuff. Shop
I've been working both my horses using these techniques & they're doing awesome.