I finally committed myself to a pair of 5.1 which I pick up tomorrow

. My next dilema is which amp to go for (I know I'm opening up a whole new can of worms here) I was going to go for a Mark & Daniel A400 ($1600 demo model) but hear it has stability issues. The only other amp I've heard so far is the Cambridge Audio 840A. My budget is around $1000. What would you suggest?
Cheers