Errmm you want to lose fat but maintain your weight- that means build muscle. Make sure you're maxing out around 8 reps on all the resistance exercises. Have you looked over the P90X nutrition guide? High protein intake is still very important but you can also eat plenty of carbs at this point. You probably want to have a diet that's somewhere between phases 2 and 3 in the guide.
edit: Back and Biceps... should be pretty easy on my foot, no?
edit: Back and Biceps... should be pretty easy on my foot, no?