Should I buy a sports sedan or a diesel truck?

I'm currently looking to for a new car since my new job requires a lot of traveling. I own a 2010 Dodge Charger, which basically means I spend $80 on gas every week. I'm looking to trade it in for a new fuel efficient sedan, but I'm interested in a truck as well. The reason being that I also own a band/sound system.

Borrowing trucks is getting really annoying. My Charger can carry a good portion of the equipment since it has very roomy interior and trunk. I would, however, prefer a truck. I would want it to be my daily commuter. I know that getting a truck beats the purpose of me complaining of gas mileage, but these new trucks do have great fuel efficiency.

I was looking for a Dodge 1500 Diesel. They are expensive, but I think the overall results will pay off.

Should I just buy a new car or a go with the truck? What car? What truck?