If the dealer can get you the 6014 with manufacturer's original warranty, why not negotiate with him for an even better deal on the AVR-X3600H that was at one point rank top on the ASR review chart?
Is there a reason why you aim for the Marantz instead of the virtual twin Denon 3600 that measured much better because Denon did not bother with the marketing hype about the redundant HDAM modules and the use of a non standard dac filter. Other than that the two are near identical in terms of the audio circuitry and components, the 6014 has a marginally larger power supply transformer. Either one will outperform the Rotel by a wide margin.
No need to be concerned about Rotel's 5 channel driven output, in real world use you won't have all 5 channel be driven to the same peak level anyway.
Rotel's specs:
1kHz, <1.0% THD, 8 ohms, DIN: 100 watts/ch (all channels driven)
Compared that to ASR's measurements on the AVR-X3700H:
This is a review and detailed measurements of Denon AVR-X3700H 9.2 channel 8K Home Theater AV Receiver (AVR). It is kindly loaned to me by a local member and costs US $1,199. Visually, if you have seen one AVR, you have seen the look of the AVR-X3700H: The input selector is plastic and...
www.audiosciencereview.com
So
@lovinthehd was right on, when he said "I'd think the amps are relatively equal overall, and any difference in power is relatively insignificant in any case."
The SR6014 should do a little better, by may be 2 to 3% more.
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