Don't know the ultimate, I found the gunshots in U-571 had much better impact with the VP180 than the M2 or VP150 I tried. I would think Avatar would be a good one for that as well. The shots really hit with a pound even with the VP150.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70