I was just looking at tonneau covers, and found that Truxedo makes one with an integrated tool box. It's about $800, but it's the best of both worlds, unless you're a contractor or something & need one of the bigger boxes.

http://www.truxedo.com/plus/truxedoplus.html

 

Yea im in the same position as you Petz but im leading more toward the tool box so i can still haul crap too....