As an instructor at our field I've got to add to this one, please get a trainer to learn on. Think about it this way--- You COULD learn to drive in a NASCAR stock car. Very similar to your situation. It's going to go too fast to learn anything good, and you're more than likely going to crash. If you get the Twist you are more than likely to very frustrated and have a sour feeling about this hobby.

Of course the guy selling the plane will tell you that it's a great plane to learn on, he wants you to buy his plane. It's kind of like a shady used car salesman, he's going to tell you anything you want to hear to make the deal. I've taught quite a few students out there that have use the Hobbico Avistar trainer.
[link]http://www.rcuniverse.com/forum/m_2560569/anchors_2824779/mpage_4/key_/anchor/tm.htm#2824779[/link]

It's only $30 more than the $250 you'd spend on the twist, and you get more. Comes with just about everything you need to get in the air. Plane, motor, and radio. It's easy to build, the longest part of getting it ready to fly is the time it takes to charge the batteries. And it is a very good flyer.

Hope this helps