I want a road bike for commuting 10 miles a day or so. I don't want a bike that is going to fall apart (of course). I can not afford more than $300 ($300 will more than break me), and I know very little about what type of bike to look for. How many gears should I have? Is a 59cm big enough (I am 6'1")? Is there a big difference between a less than $300 bike and a more than $300 bike? Will a bike on this budget last a long time for me? Is buying used okay? I need to save as much money as possible because I don't have a healthy income, and I'm a full-time student, and I don't have help from family. I hope there is some advice out there for me. Is this the right place for me to post? Thanks in advance for any and all advice.