I think that large is the way to go. It doesn't make any sense to double up on bass management and the bass management in the 990 should be better than that in the Samsung, plus you've got to manage the bass from your other sources somewhere. The 990 does that job very well.
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HT:
990/770
Oppo BD83SE
Pioneer Elite DV-47A
Magnavox HDMR513h DVR/DVD-R
Sony DVD megachangers-2
Sony CD megachangers-2
Monster power centers-2
Sony 48" rear projection SDTV
Roku video player
JVC AL-A158 Turntable
Polk RT-2000s,CS-650,XS-650s,RT80s
LFM-1EX
Hsu VTF-1
12" Velodyne

Family room:
OPPO 970
Sony 32" direct view HDTV
Denon 3801
Rolk RMs