I have this one and it is sooooooper bouncy (I can easily do doubles without a double bounce and I'm very light). It is also really safe because the net is inside the springs and frame. I would defintely get the net, it is so worth the extra money. My net has saved me countless times.
http://www.amazon.com/Foot-Magic-Cage-Octagon-Trampoline/dp/B000GU9SQ6