Is a sprung saddle the answer to the saddle problems on my commuter bike?
I used to despise the antiquated look of sprung saddles - then I got one on my retro-bike. Despite all of my preconceived opinions I immediately took to the sprung seat.

Clearly not for the road-racer, the sprung saddle has its place in regular riding, where roads are not exactly smooth. Given the choice of a couple of springs in the seat or a Kona-tractor-style-rear-suspension setup, the couple-of-springs has elegance in how it delivers comfort. Energy lost through compressing the springs is actually returned with marginable 'pedal bob'. The weight of the springs is negligible, your back wheel will thank you for them, even though only you and not the bike is being suspended. 

Given the roads you describe I would definitely recommend a sprung saddle. You would not drive those roads without the weight being suspended, on the bike your legs are the suspension, it would be nice to give them a break after a hard day's work, so why not go with the sprung seat.