Dylan, let me lay this out in very simple terms. Skidding a fix gear is the most abusive thing you can do to the hub/cog interface. Nothing except a quality hub and lockring will keep that cog on. Nothing. Do it right or don't skid. If money is tight, then REALLY take this advice because medical attention costs FAR MORE than a good fix gear hub.

I've only been riding fix gear for 90,000 miles and I don't skid, so maybe my opinion isn't worth much. I don't skid, not because it is as hard on hubs as I say, but because it is just as hard on knees and good ones are harder to find (and more expensive) than good hubs. But even without skidding, I consider my life to be worth enough that I will only ride fixed on quality hubs.

Ben