I need help finding the perfect, or near perfect, power wheelchair?

I am fifteen and have muscular dystrophy. I can move pretty much all my muscles just fine, but I'm weak and stiff and can't stand up without help. My old powered scooter has broken, and I need a powered wheelchair that is:
-easily transported (folding chair absolutely preferred)
-not binding
-can go in the grass and dirt without getting stuck
-has removable armrests and footrests, or they swing completely out of the way easily
-leather seated, or not too cushioned
-not too close to the ground (I'm short, and I don't mind my feet dangling a bit. I can't get up if it's too close to the ground)
-pretty fast (max speed 6mph+ )
-..and here's the kicker, I'd love for it to have a lifting seat that can help me stand up. This is where I've had problems, I can't find one that will do this.
It's ok if it doesn't meet all the criteria. Basically, I like the feel of a normal, manual chair, but it's powered, and can lift. Please give me links to or brands of ones you think I might like. Thank you!!