I would ordinarily agree with Pogre, but going Separates is always seemingly an investment out of proportion to other gear.
FWIW, I use my Marantz mostly as a processor, with only 2 channels being driven by its Amps. That said, the Amp stage tends to be the weak link I think.
Thoughts on the "why" to go HTP-1 is mainly about Dirac, and hopefully to have more freedom in placing Atmos speakers. Currently, Dirac works well on the HTP-1, and Monoprice/ATI is working on getting the Bass Management Module working. They have the Software from Dirac... so it is just about getting it implemented.
Most reports are that the device sounds great, especially with a successful Dirac calibration.
Audyssey XT32 is nice, but I've found too many limits in the speaker placement options in the D&M products. Coupled with usually poor Audyssey work above the Schroeder Frequency of your room... I just don't see the point in going there unless there is better implementation in the future.
If you delve into the
20+pages on the HTP-1 owners thread over at AVS, you will see the shopping list of complaints against Emo. I've pretty much written them off as a company whose products I will ever purchase. No sale will change that.
One more PLUS for the HTP-1: they have had very active support from Monolith and Dirac on the thread, as well as some other very experienced power users and industry cats giving feedback and advice.
Is it a perfect product? No... but like 85-90% of the way it seems. It is only going to get better!