It looks like your Pro-Ject Streambox acts as the streamer but I have zero personal experience with this device. If you are looking at music servers at the $1000 price point than I would recommend you contact Andrew at Small Green Computers and chat with him about an Ultra Rendu with an upgraded power supply. Excellent product and to get better you need to spend a lot more.
Most of the servers we A/B tested were $3000 and up. The exception was the Sonore products, which are very good sounding.
Cheers,