Doing cardio in conjunction with weight training should be fine if you have the energy, but save the cardio for last on weight training days, so the bulk of your energy goes to muscle building.
Another plan, that works well for me are 6 week cycles. For the first 6 weeks, I eat high carb/high protein, lift 4 days a week and cardio 2-3 days a week. This is enough "bulk time" for me. For the next six weeks, I drop the carbs significantly, lift 3 days a week (going for slightly less weight, higher reps to maintain muscle density) and do cardio 6 days a week (usually in split sessions). That way you can put all your focus into one direction or another. Some people like a longer or shorter time frame, so obviously you're free to adjust it.
Oddly enough, I find that when I am nearing the end of the "bulking" weeks, I push a lot harder since I know it's going to be just maintenence for the next 6.
Naxis
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Keep your body lean, your blood clean and your mind sharp. -Rollins
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Cardio vs. Muscle building. 
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