Yeah you will need more than x1 for the Acorns I'm pretty sure of that. I find it hard to buy an Acorn, when a 470 8G MSI model is on sale on newegg at 95$ (seems to be new...but who knows).
Do you happen to have a link.. i am guessing my search techniques are getting old.. the cheapest i can find currently is ~150 after a mail in rebate..