lol.. the one i used was an Yoyojam® XCon. you can get it at
www.extremespin.com.. actually, that model is discontinued because they break after a while (mine's a year old, and its starting to crack.), so they came out with an XConVICT. they're like $40. for beginners i'd recommend something like a.. yoyojam Lyn Fury or yoyojam Kickside.. FAST 201's are also good beginner yoyos, you can get 'em from walmart for $2. I buy em there and sell em for $5. hehe.
the yoyo I used.. I'm not sure if i did a grind in that video or not.. (where the yoyo rolls up your arm..), the yoyo has a cleaned bearing (players usually clean it themselves), so the yoyo won't come back up easily, you can see in the video that i have to do something called a BIND to bring the yoyo back up. (learn how to bind on a beginner yoyo, then get a good metal-ringed yoyo.)
For double off-string i used two yoyojam Aquarius's. those are like $25, i think.