Mookie

I recently purchased a second hand UM2 with the purpose of printing parts for a few projects. The materials I will primarily be printing are ABS, PC, and PC blends. I purchased the UM2 because of the ease of which I will be able to enclose the printer to reduce drafts and trap the noxious fumes so that I may pump them elsewhere. One day I do plan on experimenting with dual extrusion, perhaps with Foehnsturm's dual extrusion mod. But, in the meantime this printer will pretty much be dedicated to printing functional prototypes. My question is, which hotend and extruder would you run for printing primarily ABS, PC, and PC blends? I believe my best options are: -UM's UM2 to UM2+ Extrusion Upgrade Kit ($395, can't print straight PC) -E3D's UM Extrusion Upgrade Kit ($220, comes with Titan Extruder) -E3D-v6 Hotend with personally printed mount and Bondtech QR Extruder(~$274 + material to print mount) Advantages/Disadvantages: UM's Extrusion Upgrade Kit +Ease of nozzle changes +Spare parts for Foehnsturm's dual extrusion mod +No need to mess with the firmware -Can't print straight PC -Longevity of hotend at 270C E3D's UM Extrusion Upgrade Kit +Cost +Ability to print PC +Longevity of hotend at 270C -Must calibrate the machine after nozzle change -Must compile firmware myself E3D-v6 with Bondtech QR Extruder +Possibly the best extruder? +Ability to print PC +Longevity of hotend at 270C -Must calibrate the machine after nozzle change -Must compile firmware myself -Must print my own mount for the hotend If I were to print my own mount for the E3D-v6, are there any designs that some of you might recommend? Would I be able to print the mount out of ABS with the standard UM2 head and have it last?