How can a PS Audio Perfect Wave DAC enhance my system?

So if I was to use the PS Audio DAC in place of the DAC in my Marantz, wouldn't I just be improving the playback of my SACDs only?  My SACDs are a very small part of my digital collection on my A-500 NAS.  The PS Audio DAC is $8500 in my country which seems like a lot if all I am able to use it on is my SACD transport.  I'm hoping I've got this right.

Through the course of my reseach, it seems the DAC is best served when you have a music collection on a PC and the PC connected to the DAC by USB.  From what I can tell assuming I have this right, I don't fit this setup.

Thanks for the replies.

My Popcorn Hour A-500 has an ESS SABRE ES9023P audio DAC and plays all my digital formats including my library of DSF files.  Same with my Marantz SA-14S1 SACD.  It has a Cirrus Logic DAC and performs as you would expect from Marantz so I am not sure why I would want to bypass the Marantz DAC on the notion that it might sound better.

I'm sure if I called PS Audio they would take great pleasure in telling me why I should use their DAC.

I had an opportunity to pick up a PS Audio Perfect Wave DAC.  I read the DAC connects directly to the power amp, in my case a McIntosh MC500, so what do I do with my McIntosh C48 preamp?

Thankyou mahler123.  I feel more comfortable not having to discard my McIntosh preamp.  Just trying to  understand the I2S as this is new to me.  I have the opportunity to buy the PSA DAC so that would be an expensive way to audition if it is as subjective as you suggest.

Fuzztone, thank you for your stellar contribution to this thread. 

Thanks for the grea info mahler123.  My Marantz SACD has coax and Toslink digital outputs.  Can they be utilized?  There is no HDMI or I2S.

With the Bridge II do you stream from a DLNA server across Ethernet?

I would like to thank everyone who has contributed and helped me with my decision to add a DAC to my system.  My window of opportunity was closing so I went ahead and purchased the PS Audio Perfect Wave DAC Mk II with Bridge.  I am currently waiting for shipment.

If no one objects, could we use this same thread while I look for your advise on integrating this into my setup?

I plan to keep my McIntosh C48 preamp in my system.  Knowing the PSA has a bridge card will make it easy to stream my digital files on my Popcorn Hour A-500.

The C48 has several digital inputs apart from the conventional RCA inputs.  There is a USB, optical, and cable input.  Also, there is an XLR balanced input and I believe you can take something like PHONO1 or PHONO2 and swap that source to balanced input.  I will check the manual.

I would like to run my Marantz SACD through the PSA too.  The only digital outputs on this are optical and coax.  I just learned the optical connection is limited in its sampling rate.  

In advance, thanks to everyone.

I am quite optimistic that will not be an issue with the PSA bridge as as the Popcorn Hour A-500 supports DLNA (UPNP) and I can already see the files across my network on a variety of devices.  Just being able to stream across the LAN makes everything a lot easier.  My music file are mostly FLAC and DSF.

My only other digital source is my SACD and to be honest, I don't use it that much.  My hi-res SACD collection is not large and I notice the selection and prices on Discogs are less attractive recently.

UPDATE:

I took my PerfectWave Mk II DAC and upgraded it to a DirectStream Sr. with a Bridge II card.  I retired my A-500 music server and got a good deal on an Aurender N100H 4GB.  I'm back in business and the DSD sounds amazing.  Thanks for all the input.