2004 Giant OCR3. Uprade or replace?
Hey, I have a 2004 Giant OCR3 and I'm thinking about upgrading the components. It has Shimano Sora. I want at least 105. I like the frame so I would like to keep it. I'm on a budget of about $400 to upgrade or money I get from bike plus 400 if I sell my current bike.
Would it be worth it to upgrade? What should I get?