Need New 2 Channel System for under 25K

Hi,

Trying to help a friend set up a new 2 channel system for his office where he spends 12hour days.
Hi budget is $25K MAX on the entire system.  The office is 8'x12' with 8ft ceiling. It has a large desk and several book shelves and large window. 

He wants to stream from the Internet or from his NAS drive and play CDs.

He wants to spend the money in phases and he is not in a rush.  He also wants the system to be bookshelf based (make sense for a smaller size room like this), but wants to start by purchasing electronics first (this is because he has a pair of lower-midlevel Focal bookshelves and a pair of lower-midlevel Sonus Faber bookshelf's so he wants to play around with those speakers first and then upgrade to the strategic bookshelves when he gets some more funds.
 Ability to plug in headphones into the electronics is definitely a plus and headphones themselves are not part of the 25k budget as he has Sennheiser HD600 and his happy with them for now. 

According to him, physicals size of components is not that important to him, but I know that it will become important later in a small office like his.  He is also into esthetics of his systems.

So I we were thinking of going with 'used' components to get more value but with relatively newer models
For example, if it is possible to find in USED but good condition: 
 1. -Simaudio 680D V2, and 600I V2 together for $12.5K, that would be good  (no CD playback here however and no headphone amp, but thats ok)
 2. -Bit later get a pair of Focal Diablos for about $7.5K if possible 
 3. -That leaves about $5K for cables, power conditioning, cords, Interconnects, etc.

The electronics can stand on his desk (if they fit), or can be put on a rack (which would also need to be purchased)

The Simaudio components are good size and very good quality and I think the system would synergize together very well.

Can any one suggest something comparable or better for the money based on the requirements.  Also If we can get a comparable system in a different brand for less money, that would be great.  (i.e. Perhaps  Lumin Streamer/DAC with a Pass labs INT 250 and pair of Paradigm Persona Bookshelves :)

Please let me know if there are any other details I can provide.
Thank you in advance!