As others have said, I also use Lawson's ti hook stakes and they have worked quite well. However, about a year and a half ago now, I decided to start carrying 2 slightly larger diameter stakes for a little better holding power. I like the MSR Carbon Core stakes pretty well, although, for the price, I find it hard to recommend them... I picked mine up with a dividend balance and the 20% off discount.
I also have some of the Sorex stakes from Ruta Locura, and while I don't have the use with them like the MSR's or Lawson's ti hook stakes, I do like them...
Also, take note that both the front and middle back tie out are taking a huge amount of the load on this tent, not just the front stake. If you are concerned with this, I would suggest to carry 2 larger stakes and use them at the front and back, then pin the rest of the tie outs down with some ti hook stakes.