Jolida, Glass FX Tube DAC III vs Fusion DAC Pre

I am setting up a two channel system in a spare room in my new house. It will be 11 feet x 12 feet, carpeted. Most of my music is in digital (mp3, FLAC, etc) format. I plan on using my Windows computer as the "source". I may hook up a CD player or Phono at some point.

My amp will be a Parasound HCA-1500A, a solid state amp with 205 W/ch. This has more than enough power for the size room.

As far as speakers, I plan on going with bookshelfs, something in the $1500 range. I will probably look at something like the KEF LS-50s, Epos Elan 15, or something from Focal/JM Lab, PMC, PSB, B&W etc. Another option would be to steal the Meadowlark Kestrals from my home theater system.

The main question I have, is how to get the "music" from the digital source to the speakers. I don't want to spend more than about $1500 between PC out and AMP in.

All I really need is USB/Coax/SPDIF inputs, volume control, and RCA outs to the amp. I realize USB has a host of issues, so I would consider getting a USB/SPDIF converter such as the TeraLink X2, if that would help improve the sound.

I am leaning towards either the Jolida Glass FX Tube DAC III ($500), or the Jolida Fusion DAC Pre ($950). Is there a big difference in sound quality between the two? They use the same DACs and tubes. The Fusion adds Bluetooth, which I would use, and has more switching functionality. But as far as sound quality, can I get the Glass FX and put the extra 500 bucks toward the other components?

Glass FX + B&W PM1; or Fusion DAC Pre + B&W CM5?? These are the tradeoffs I am looking at.

Thanks if you read this far, I'd rather include more detail than less.

I listen to a mix of Jazz, Bluegrass, Classical, and everything else (Allison Krauss, Frank Zappa, Derek Trucks, Zakir Hussain, Art Blakey, Chris Thile, Joshua Redman, Kathleen Battle, Smashing Pumpkins...)