Nothing, really. You could build Klimax DS functionalities (don't have Akurate DS)using a server + Transporter + dCS or any of the other $15k DACs out there. The downside is that there will be more jitter in the system than using your Linn DS alone (may be you can hear this, may be not), not to mention the cost of an extra one or two digital cables and power cables. So you may or may not actually save any money going multi-box route, but it will certainly not sound better.
I personally don't mind listening to mp3 (320kps) using Klimax DS. It sounds a whole lota more analog and musical than the same CD played back on the CDP that Klimax replaced. Yes, mp3s sound great, CDs sound amazing and hi-res sounds heavenly.
Seriously, one box, and you are done - what's not to like.