Upgrading receiver: Got a pair of Dynaudio Sapphires+NAD C740


Hi,

I recently upgraded from Totem Staafs to Dynaudio Sapphires and of course love the new speakers. I believe my receiver is not doing justice to the speakers and need to upgrade. My budget at this time is $1500. Here are my constraints and questions:
1) If it is worth upgrading from NAD c740 to a higher end Stereo receiver?
2) I need a receiver with ability to drive two pairs of speakers (main dynaudios and other ones are totems in another room). Any suggestions?

ray_sonya
I have the C1's currently set up in my living room with a complete tube setup and there is no problem filling the room up with sound with low distortion. 

I am not that familiar with the Sapphires so I don't know if a tube amp will power them or not. I have also owned the contours and ran them on the same setup I am running with the C-1's and did not have a problem.

I'd suggest you get the Musical Fidelity Tri-vista integrated amp that is currently listed on agon for a very good price
Id suggest you save your money and up your budget and get something worthy of the Dyns
Thanks folks. I apologize but I am an amateur so here are the next set of choices:
1) SimAudio Moon 400m
2) Bryston 4BSST2
3) BelConto Ref 1000M

Which one should I go for and why? Thanks again!!!