<font color=8fbc8f>Cardio is for the heart. Yes it will define and tone, but it's for the heart. It will not detract from your build model, but if you are wanting big gains, which I don't think is your goal, then you can still implement cardio into your training cycle without loss of your personal focus..
This is a whole different subject than bulking, and weight lifting. Cardio should be done by any measures 3 x times a week. Any Dr. (MD), or fitness specialist will reccomend MORE, MORE, MORE. Some even suggesting daily, and altering your method.

Where as weight training, 90% will advise 4x2 work rest, recycle.

Don't fall into the hype that only food (product) X will ONLY provide you these results. You need a good diet, and use protein shakes only as a supplement, not as your mainstay.

Also, have you been over to 'Mens Health' online, and searched around within their fitness area?</font>

Not yet, thanks for the advice. I do keep a good diet, and usually get 5-6 cardio sessions done a week.