I would agree that it's still going to make you healthier. It's not a black and white thing. You can do a lot of good without going whole hog (pun intended) into organic and grass fed.
BUT... I will say that, if you are going to be buying grocery store beef (which is what I do, so no judgment from me), I would try to either buy leaner cuts or trim off some of the fat. Eating fat is fine, but animals will store the crappy stuff in their fat, so it's not going to be as good for you as the fat of a grass fed cow that wandered the fields until 3 minutes before it went to Bovine Heaven.
+1. Get your fats from sources other than conventional meat. Olive oil, nuts, avocado, coconut oil/milk, butter/ghee. Also, Costco has pretty good quality meat if you can afford to buy in bulk, it's cheaper in the long run too.