With that budget you really should consider the Ultimaker 2… you’ve got a few choices in that price range at the moment but stretching to the Ultimaker 2 Extended plus would be my advice. You could always forget the plus and upgrade to an Olsson block yourself… easy upgrade. Having said that the main downside of the Ultimaker is no dual extrusion for support material but it makes up for that with it’s higher quality results.
It’s also definitely a plug n play type printer… however you will still have to get your hands dirty at some point along the line… but community support is also second to none. One bit of final advice is DO NOT buy a 3D printer which has it’s own filaments (proprietary)… always too restrictive if you want to experiment with new materials regarding prototyping.
Take a good look at the Tiertime UPBox. I run one and it has been a breeze to operate, produces good prints and has a fairly large build volume. If some curious person hadn’t opened the lid, let the heat out and warped the part, my first print would have been sold to a customer - not bad for a Friday evening “impulse” purchase…
I would recommend the Zortrax M200. Look at the stats in 3D Hubs and see the great number of reviews that has been posted. This is an no non sense machine that performs right out of the box. Perfect for prototypes. The filaments are not that expensive for the quality you get and makes up for the failed prints you would spend your cheap filament on with other printers.
“My main goal is prototyping so print quality is most important to me”. I couldn’t find better prototyping solution than Zortrax M200 + Z-ULTRAT so I bought M200 a month ago. I don’t care if it uses proprietary material as long as it produces no-problem high-quality prints using really sturdy material.
So you don’t care that you can’t print a whole host of new and experimental filaments which include Bronze, Copper, Wood, Carbon Fiber, Moldlay (for lost wax molds)… the list is endless and growing daily. Prototyping is about experimentation not restriction…