Combining home theater with two channel

My dealer suggested that I add an integrated amp to the system to play music.

BINGO! Your dealer nailed it (along with everyone above). The cheapest option to dramatically improve your 2-channel performance is to incorporate a good stereo integrated (w/HT Bypass if possible but not absolutely necessary, which opens up more possibilities).

I'd try to work with your dealer to demo a good integrated — that being one that has the same characteristics you’re looking to improve upon — and see how that goes. Your speakers are revealing enough that I think you’ll hear quite a big improvement, and if they’re the model I think you have 150Wpc may well be plenty. Anyway, best of luck in your quest.

OP might look for a high quality used processor to use with his amp rather than an integrated.  I use a pricy Bryston SP3, but I think a Cary Cinema 12 would be fine.  My setup is similar to that described by bkeske.  The SP3 sends balanced front LR analog to an Ayre KX-5 Twenty preamp bypass and center channel directly to a Parasound JC 1 amp.  A good processor direct to his amp should be fine for stereo and HT without a separate preamp. 

i have a marantz 7011 for home theatre running into a vitus intergrated with home theatre bypass. i use an ayon s10 sig streamer dac into the vitus for music.

its the best way for both worlds. i believe the vitus also helps with its pre for hometheatre. i dont use a centre as my two fronts are good enough. wilson benesch precision p3.0.

Get 2 monoblock amps for your R1's and a mono amp for your center speaker.

That is what I'm doing. Model 12's monoblocks for my floor standers and a model 201 for my center speaker. All through a Classe SSP-800. 

Gave away multi channel altogether and have never missed it. The same money spent on 2 channel yields much better results.