I have the Xtrema 2 (had two, sold one just recently) and A400 Xtreme (both have kickoff), and both are great guns. However, the A400 gives you more adjustability with the length of pull (LOP).
The Xtrema 2 w/kickoff has a set LOP, it is what it is, and that could be a problem for someone with shorter arms. The kickoff on the A400 Xtreme is integrated differently into the stock and allows for different thickness spacers to be installed to adjust LOP. This setup is better for someone with shorter arms.
Keep looking and be patient. I have found some good deals, but you have to be ready to put out the cash when you see them. And I wouldn't be afraid of buying a gun from someone on GunBroker (which I have) if they have a good rating.