Sorry, i didn't really explain properly.
I'm quite a skinny guy, at around 180 pounds, 6"4. I worked hard to get to that weight and don't want to lose any of it by doing cardio. But i also want to get fitter, increase my VO2 max (i think its called that), so i can run for longer etc. - I'm a basketball player, and i know endurance is key.
So i guess my goal is to get fitter but not lose any of my weight.