I was planning to build a second bike just for booting around town and maybe some easy off-road. I was going to use a used Specialized, Gary Fisher or KHS frame because they are easy to get used here in Korea. I was also going to put it together almost entirely from used parts because this will be my first build and I don't want to break good stuff. Which parts would you recommend as being worth buying used and which parts would you absolutely not buy used. I don't mind buying new parts if necessary but I already spent over $5000 on my racing bike and other gear this year and I would like to keep my wife.