The thread about cheap bikes got me thinking. I am keeping my eyes open for a good deal on a used bike, but I want to make sure I get quality parts when I do. So where is the line between cheap and quality? Let's just say for the Shimano line is it 2300, Sora, Tiagra, or 105? I think higher than that gets in to the high end stuff. What should I set as my bottom limit? I want something that should last a few years if taken care of.
Edited to add:
I should have included my intended usage. This will be a road bike that will see a lot of hills. I don't ever see myself doing any kind of competition just riding by myself for 300 to 500 miles a month (I hope). I will probably never get below 200 pounds goal is around 200-205 if that is a factor.