If I were you I would use the ProAc and Niam. Just feed your digital signal from the HA-1 RCA preout, to the Naim Uniti 2 an. 1 input and you should be golden. The ProAc and the Niam will trounce the lower cost speakers listed.
If you want an upgrade go to the higher end speakers that were listed. The Dynaudio neos are excellent as is the KEF LSW. The LSWs are sexy too!
I run Emotiva Stealth 8s for my desktop setup and love them, but these will be way to big for your area. The stealth 5s would fit just right I think. Here is a link to some for sale on Ebay....
https://www.ebay.com/itm/Emotiva-Stealth-5/143547767629?hash=item216c1d1b4d:g:A3AAAOSwOL9eYIg2
If you want an upgrade go to the higher end speakers that were listed. The Dynaudio neos are excellent as is the KEF LSW. The LSWs are sexy too!
I run Emotiva Stealth 8s for my desktop setup and love them, but these will be way to big for your area. The stealth 5s would fit just right I think. Here is a link to some for sale on Ebay....
https://www.ebay.com/itm/Emotiva-Stealth-5/143547767629?hash=item216c1d1b4d:g:A3AAAOSwOL9eYIg2