You might want to check out this site (no affiliations):
Need some lessons on how to attach links, sorry if it doesn't create a link. The Alpines white94ranger has are a pretty nice setup. You just have to decide what you want to spend. Don't cheap out on the wires, though.
BTW, thanks for the link to your box. Been looking for a box design for my son's truck and your link is kind enough to share the full dimensions. Will be making some sawdust this weekend.