I also vote for the 7890A. It has more useful drive bays than the 7896A. The 7896A has an extra intake fan which offers little benefit for case cooling. The 7890A is more widely available and can be purchase as SuperMicro 750A too. Therefore, you can get it very inexpensively.
I purchased the 7890A for $100 shipped ($120 now) and an Enermax 450W dual fan Power supply for $95 ($75 now). It is the best under $200 case in terms of power, cooling, low noise and case quality.