http://www.amazon.com/Ridgid-88387-Power-Drain-Cleaner/dp/B00203U69K/ref=sr_1_4?s=hi&ie=UTF8&qid=1329356862&sr=1-4
This one has a patent to go forward n backward with a trigger and drill, you will love it. Don't buy the cheaper ones.
For first time user, the KEY is to hold the snake as close to entrance of the pipe as possible.