1. Dual Extrusion
2. Flexible filament support out of the box, no modding
3. Complete Enclosure
4. Heated bed
5. Hot end ability to reach 270C
6. Auto bed leveling
7. SD support
8. Open source, no proprietary filament or software suites. Love my Sinplify3D
9. High reliability and repeatability, will be run on average of 18/7
10. Excellent customer service!!!
Yes I am picky, but down time and fussing constantly with subpar printers is lost revenue
Hi @Phoenix3DS, did you check our newly launched 2016 3D Printer Guide? It’s put together based on the reviews of over 5350 Hubs - it should be a nice starting point for you 
For $3500 you will not find all of those. I’m not even sure if any budget will hit all 10 of those.