What they said, but also don't under-estimate what a little elbow grease and polish will do to make a bike look new again. I'm currently working on a bike for my velo-cheapo build, but after shining up a couple of parts, I have to re-evaluate them. Now I'm going to have to keep them and send the bike off with something a little less nice. Since you're keeping the bike, any components that you think will give it that extra something are worth it. Maybe not for resale value, but for personal enjoyment.