One to consider. I have one and it works very well. Small foot print, when it stands vertically. I changed the provided 120 GB SSD to a 250 GB SSD and can run Hauptwerk and a sample set such as Armley Schulze on just the SSD - quite fast loading for such a medium/large sample set. (Not using surround, but both Chancel & Nave ranks) Had to adjust ranks to fit, but sounds great. Using a MOTU Ultralite Hybrid as an external USB sound card for 8 output channels. Using the HDD as backup.
HP Elite 8300 Intel i7 3770 3.4Ghz 32GB RAM 120GB SSD 500GB HDD 2x NVS310 Win7 Pro, many USB 2.0 and 3.0 ports. I consider this computer to be a commercial/industrial grade machine.
https://www.ebay.com/itm/HP-Elite-8300-Intel-i7-3770-3-4Ghz-32GB-RAM-120GB-SSD-500GB-HDD-2x-NVS310-Win7/123115487873?_trksid=p2485497.m4902.l9144Rgds,
Ed