The Hsu VTF-15h x 2 & Denon 4311 are fine.
Can you mount the center speaker above or below the TV?
I bought the TAD 2201 for $1691/pr delivered (MSRP $3K).
TAD at Music Direct
They're very accurate w/ excellent off-axis up to 60 degrees. They also sound as loud as my B&W 802D2, which is 90dB/2.83V/m.
TAD makes 4 speakers: an $80K tower, $30K tower, $30K monitor, and $3K monitor (TAD 2201).
3 pairs of TAD 2201 would be $5K delivered. It would be a 6.2 system.
Electronics Expo sold the Denon 4311 for $1225 delivered (deal on the phone). See if they have some more in stock. Also talk to Vanns & Onecall and see if they will match that $1225 price.