Many thanks Socketman,
I think I see a complete picture now on this upgrade from 7.1 to 11.2.
The system will be: (with factory direct pricing)
1 Center: VP160 ($666)
2 front towers: M50's (from my previous system)
2 Subwoofers: EP350 x2, (1 old, and purchasing 1 for $801)
4 Surrounds on wall: M22s ($1152)
4 In-Ceiling: M3's ($896)
Receiver will be Denon EVRX6300H 11.2 ($2199)
Total for all that is $5714. Add a $2000 TV and I'm about $700 over budget.
So it's possible to pull off this 7.1 to 11.2 upgrade for about $7700. I can live with that.
Many thanks for all your help!