Yes the retail price is $3k, but if you call Mehran at Sorasound in San Francisco, Ca., he might be able to help you with a demo piece. Sometimes, depending on circumstances, some latitude in pricing might be possible. He's a very nice guy and is a great resource for vinyl hardware. I've only seen one for sale used over the years here on Audiogon, so it seems most folks who buy them hang on to them. If the RCM proves not to be option, I'm sure a demo/used Parasound phono stage will pop up for sale and make you very happy.
I've not heard the Naim Superline. As to the ZYX R50 vs. Denon, I can't help you. I'll confess that I'm not that much of a fan of the Denon cartridges I've heard. Right now, the main cartridge I'm using is an Ortofon Kontrapunkt H and will upgrade to a Cadenza black in the future. I could see how someone might prefer a slight bit of additional warmth in the RCM if the rest of the vinyl chain, audio system, or room had any tendency to brightness. I find the RCM a quite neutral conduit. I like the idea of a transparent phono stage and adding needed warmth though your choice of cartridge.
I've not heard the Naim Superline. As to the ZYX R50 vs. Denon, I can't help you. I'll confess that I'm not that much of a fan of the Denon cartridges I've heard. Right now, the main cartridge I'm using is an Ortofon Kontrapunkt H and will upgrade to a Cadenza black in the future. I could see how someone might prefer a slight bit of additional warmth in the RCM if the rest of the vinyl chain, audio system, or room had any tendency to brightness. I find the RCM a quite neutral conduit. I like the idea of a transparent phono stage and adding needed warmth though your choice of cartridge.