I don't think the Vizio is big enough. Just kidding. That's a huge screen. Definitely would like to hear your impressions after some more viewing time compared to the plasma. What plasma do you have now?
Here's the setup in my dedicated media room:
Pioneer Elite 141FD Signature
Oppo Digital BDP-103D Darbee Edition
Meridian 568.2MM
Meridian 598DP
Bryston 6B-ST
Emotiva XPA-2
Velodyne SMS-1
Velodyne HGS15II
Velodyne DD18
B&W Nautilus 804
B&W Nautilus HTM1
Equitech 2Q
Equitech 1.5BQ
Equitech 2BQ
Acoustical Solutions bass traps and panels
This is the in room bass response as measured by the SMS-1/DD18:
This is the calibration report after getting the 141FD ISF calibrated by D-Nice of AVS Forum fame: