Looking for opinion on bed swap

[OhCookie]

I am needing some guidance from those of you with more knowledge and experience with these trucks since I am fairly new to this.

I have a 1970 C20 with a long bed. The bed on my truck is not original to the truck or the year so it does not match. The wood needs to be completely replaced. I recently came upon an opportunity to purchase a metal long bed that has the tool box storage but the storage door has cancer. The seller is asking $400 for the bed. Is that reasonable? It seems the beds with storage do not come up often on craigslist, but with the rot in the door I'm not sure what amount would be reasonable. If I buy it I would get a bed that matches the color of my truck and one that is metal vs. wood. Thoughts?

Thanks for your help.