I also started with a Marantz AVR, moved to B&K Surround Processor plus a Gemstone 7-ch amp, and finally added a set of 2-ch gear. I have the same Velo SPL-1500R subwoofer. I concluded that I couldn't be happy with muti-channel gear for 2-ch music.
If I had to do it all over again, I would have just kept the AVR and added the 2-ch gear as the L/R channels since I cannot have dedicated rooms for HT and 2ch music. I am a music lover and I also like movies. I found most sound comes from the L/C/R channels for HT. If you off load the L/R channels to the 2-ch gear, the AVR is likely to be sufficient. Additionally, the Velo sub is 1,000W RMS (2,000W peak!), further reducing the demand to the AVR.
A key in this integrated HT/2CH is isolating the noises from the HT gear to the 2-ch gear. But that is another subject.
If I had to do it all over again, I would have just kept the AVR and added the 2-ch gear as the L/R channels since I cannot have dedicated rooms for HT and 2ch music. I am a music lover and I also like movies. I found most sound comes from the L/C/R channels for HT. If you off load the L/R channels to the 2-ch gear, the AVR is likely to be sufficient. Additionally, the Velo sub is 1,000W RMS (2,000W peak!), further reducing the demand to the AVR.
A key in this integrated HT/2CH is isolating the noises from the HT gear to the 2-ch gear. But that is another subject.