Placed an order for some goodies:

• Additional extruder
  
  • Already have the adapter printed
• Cheap nozzles to play around with
• 1/4" OD x 15.88 mm long, 350 °C-rated, 3 ohm @ 3% wirewound resistors
  
  • Shouldn't draw more than about 4.1 watts.
  • Overkill? Yes.
  • Bump 250 °C extruder temp to 350 °C? Sure.
• 100 mm x 100 mm silicone heating pad
  
  • Top end temp is reportedly 120 °C
  • Draws no more than 6.5 watts
• 40mm Noctua fan
  
  • Additional cooling power never hurt, though the firmware doesn't let the fan turn off currently, but I've not tried direct GCODE commands.
• MOSFETS to play with for the heater bed & hotend
• Higher temperature rated power cap for the driver board
  • For every 10 °C lower temp than the max rated, you double the life of the cap.
• Low ESL replacement caps for the remaining 3

Side note, found 2 of the 'stock' hotends on Amazon while browsing around:

• First one
• Second one

I realize that I'll be pushing the provided power brick to its limit, however, I'll only be testing one upgrade at a time. Initially, I will be hooking up my scope and current probe(s) to monitor current draw in order to correctly tune the *stock* heater and heated bed. Based on the current observations from the printing I've done, it appears that I'll have to build in some rapid (2-5 Hz), low amplitude oscillations in order to compensate for the thermistor noise that produces inherent instability.