What speakers to Buy. Big Room -- Bookcase App.

Hello all. Thanks for the great board. I need help from those who know more about this than I. I just installed a McIntosh MX134 and MC206 Amp. They sound great and were well worth the $$$. I have a room about 22 X 18 and I have an Energy Veritas Center, a pair of Energy C6's for left and right and two energy RSS rear surrounds. My sub is a pinnacle baby boomer. The sound has improved tremendously over my previous pioneer elite receiver. However, the stero guy who installed it says my speakers need to be upgraged to get the "Full Benefit" of the McIntosh. They are pushing Revel M20's and C30 center or Dynaudio products together with a Rel sub. They say I'll hear about a 20% imporvement over what I have but that costs between $6k and $8k more. I listened to their speakers but frankly don't hear that big a difference to justify the $$$. Do you all have an opinion about what I should do or can you recommend other products that might work better for less or equal $$$. The one issue is that the front soundtage is mounted on shelves (the TV is built in to Cherry bookcases). Therefore, they say there are only a few speakers that will work well on bookcases and that the C6's are not made to be horizontally mounted as they are and that is what is limiting them.
Thoughts and suggestions are appreciated.

Happy thanksgiving one and all.

Dave