A few assorted notes:
A good place to ask for printer recomendtions is here
http://www.reddit.com/r/3Dprinting. There is also a local group that meets periodically
https://groups.google.com/forum/#!forum/bay-area-reprap.
Air draft is not an issue with PLA, actually some printers even have a material cooling fan to improve PLA printing.
Heated bed is not required for PLA but improves adhesion to the bed.
Dual extruder machine allows soluble support. Never used it and know know if it will be useful for your case. Probably not (PCB cases, standoffs, etc). All printers support automatic material support with the normal filament.
SLA printers are not good for your application. The material is too brittle.
I wouldn't buy a printer that requires to connecting the computer to it (e.g. that Up+ printer I used that required the computer to be connected throughout the printing). An LCD screen with stand alone user interface and SD card is very useful. Some printers even even Wifi link so you can print remotely (assuming your printer is clean and ready to print).
Auto leveling is important for an 'appliance' experience. Mine doesn't have it and it's a pain. The first layer or extrusion is the most important as it controls the adhesion to the bed.
1mm tolerance shouldn't be a problem with any 3D printer.
Hair spray is nasty. Hard to remove and if it gets on your plastic glasses they are gone. Use one of the friendlier methods (I am using that water soluble Elmer purple glue stick).
I wouldn't go with a printer that locks you to proprietary consumable unless, maybe, if it is a brand name (e.g. Makerbot).
The Dremel printer is rebranded from here (this company has good reputation)
http://www.flashforge-usa.com/shop/3d-printers.htmlMakerbot put a lot of effort into making their products consumer friendly and accessible. There products and consumables are relatively expensive but are often consider to the reference for quality ("this filament is as good as Makerbots'"). I used their older two extruder wood frame unit and it gave excellent results, including with ABS. Didn't use their new models but saw them in a local Microsoft store (Stanford mall) and they look awesome.
The wide selection of 3D printers with none being a clear winner may be paralyzing. You just need to pick one and most likely it will work fine. I picked the Prusa i3v kit and it works for me.
Good luck.