I think you'd be amazed at what you can get away with and stay lean so long as you keep at it in the gym. I recently took 2 weeks off of my diet for a break and decided to give DC's eating methods a try for future reference. To make a long story short I was actually eating above what I thought was my maintenance calories(~3500) yet after 2 weeks I had actually lost weight. Which means I could have actually eaten even more to maintain. I actually lost the weight in the first week and then in the 2nd week I allowed myself more freedom in food choices and it kept me at the same weight.
I won't go into all of DC's recommendations here as you can find them if you look around, but basically it's high protein with moderate carbs/fats of the healthy kind. Protein is always eaten first to ensure you get it and to help fill you up so you don't overeat on the rest. He also cuts off carbs and fats at a designated time except for post workout nutrition. Add in some key supps(r-ala, cla, green tea, etc..) and you'll be mildly surprised at what's possible.