Keep my car or trade/sell it for something else?

I have a 03' Nissan 350z with about 60k miles on it. I love the car but i need something i can throw my surfboard or snowboard in and travel easier in and it doesn't cut it. I bought the car in March of 06' for $19k after $10k down. The car is going to need new tires in 4-6 month that cost around $700 - $1100 depending on brand and performance. My questions are pretty much...Should I trade/sell it and get a different vehicle that suits my needs better? and btw I dont have any money to put down on a new car should i choose to do it.