Also is it possible to get a touch screen as well?
Once a week I might on my com for 24 -48 hours without closing it..
Hi TS.
Touch screen feels really cumbersome, especially on a large screen. Reason being that reaching over your desk to poke your screen can be quite tiring after a long while. If you really need a touchscreen for whatever reason (e.g. More user friendly for a family member who's new to computers and just want to check 4D), do go ahead. Else, will be better to just stick to mouse and keyboard as input.
Considering your budget, and if die die want touch screen, I'd rather you get a Surface Pro 3/4 and have it connected to a large monitor by Surface Dock. At least you'll get a touch screen device that you can comfortably use when undocked and you can just poke the screen with minimal effort, and still get all the additional USB ports for mouse and keyboard.
If you decide touch screen isn't for you, then go for a 27 inch display and a SFF (small form factor) DIY build. If SFF is still too big, then go for something like Zotac's ZBox or Gigabyte Brix (small profile rig about same size as Mac Mini) .