please help me out  , im a music lover but have 100's of music videos & 100's of cds as lossless flac and ape files on my pc , im a dedicated grado ps1000 headphone user & im wanting to know which would be best 2 channel ballanced 24/96 or would  prefer 24/192 , had to sell headphone amp , cd transport & dac to buy dam ?1,500.00 grado ps1000 headphones but their worth it ,

which of these would be best for my needs

1 - ?700.00 uk pound headphone amplifier + fireface uc usb + hdspe aio pci-e

2 -  ?700.00 uk pound headphone amplifier + just hdspe aio

3 -  ?700.00 uk pound headphone amplifier + just fireface uc usb

4 -  ?700.00 uk pound headphone amplifier + 2 x multiface i or ii or other similar + 2 x hdspe pci-e cards

5 - ?1,000.00 uk pounds dedicated hi-fi external dac + best internal/external pc hardware to send  ballanced xlr pc audio to the dac

6 - benchmark dac1 or grace m902 + other internal/external pc hardware to send ballanced xlr pc audio to the dac in the dac1

7 - another suggestion of any make or setup etc

any help very much appreciated thankyou paul. ed: