So if I wanted to keep the cost around $100 or less, what would give me the most bang for the buck in terms of making climbing a little easier? Would the 39 tooth lower chainring make a notable difference? From what I've read so far, the compact double sounds like it might be the best bet-it seems like theoretically I could make that switch without a lot of other modifications and get a more noticeable effect on climbing than just switching to the 39t lower chainring, although just switching the ring and the cranks seems like the easiest and cheapest option. Any opinions on that?