I have to agree with you actually. RoB is a better player resource than anything else, vehicles aside. MotX is meat for the GM.

Thanks, all! Well, the overall consensus seems to be that Mark of the Xenos is the Must Buy.

After looking at the bill situation, I might just go for one book right now. The refund should come in sometime in the next week, and I'll see what we've got left over once some debts are paid and the bills are sorted!