If you want to maximise energy levels but strip body fat off, focus on keeping complex carbs to only after training as recovery with clean food at all other times.
Lots of vegetables for recovery processes and obviously protein - aim for 80-120g per day depending on your size.
As for training, you don't need to be doing long runs.
I was checking out Chuck Liddell's training and then tried to convert his mammoth workouts to something more applicable to the gym. As you'll see there is little need to separate cardio training from resistance in some cases - this will sort you out!
Check out his training here....