What's the best slow cooker (Crock-pot, etc.) available for a reasonable price?

I'm trying to find a good Slow Cooker for my mom this Christmas but the reviews on amazon.com aren't very good. Most have low scores, but some have high scores but they all still have at least one review that says "Cooks food too fast!" Either all the slow cookers they have for sale don't work right or the reviewers are stupid and are using them wrong. What is the best cheap (-$100) slow cooker available?