A 65" V10 Panny, very, very nice TV, I love my 58" S1 Panny.

I can see why you want to get the speakers off the floor with that opening off to the side other wise I would say keep the M60s the room looks to be big enough once the TV is wall mounted.

If you haven't picked up a wall mount yet, get one from Monoprice.com. I am using the cheapest tilting one they had, $18.99 and it works great.

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