If you do the math this project seems to be on the trend towards 9750 units being manufactured for the kickstarter alone. (3250 >$100 backers / 10days * 30days)

Assuming the fact they where originally going to produce the <5000 unit run locally and move to injection molding for >5000 units I think its reasonable to suggest that if they are looking at a >10k unit run they should move to offshore assembely as their is nobody able to assembly this equipment in that large of scale locally so if you move it away from home then make it count! By moving overseas they can easily cut manufacturing and assembly costs by 30%.

I propose that the stretch goals be:

>10k units: Offshore production and assembly.
- immediate plans for microcontroller based controls at an extra $20-25.
- Reservoirs, stand and hoses included in a kit form for additional $20-25.
>15k units: microcontroller based controls at NO extra cost.
>20k units: Reservoirs, stand and hoses included in kit form at NO extra cost.
>25k units: Reservoirs, stand and hoses included with fittings mounted, total plug & play kit at NO extra cost.

I believe that is plenty fair as the idea behind the kickstarter is not to make an immediate profit on the first production run but to use every penny to make a product that will sell on day one of public release. And that is where you make a profit. With those manufacturing quantities you will easily stay below the $100/unit to manufacture.

As for the microcontroller I recommended using the same configuration that people are already familiar with, that being a 20x4 character LCD, rotary encoder and sd card slot. I would recommend the STM32 Cortex M3/M4 series as they are one of the most affordable, I also recommended using a standard USB slot instead of the expensive sd card slot, that way a simple keystick will work for everyone. (I had a heck of a time finding a 2gb or smaller SD card for my Prusa i3!)

A NOTE FOR EVERYONE:
Please try and remember guys that the whole point of crowdsource funding is that you DONATE your money in hopes that they product the product that you believe in and it does all the things you want. If you are only pledging because you just want a full printer for $100 then you are not in the right mindset. If you want every bang for your buck wait until everyone has a Peachy Printer and then haggle for one on eBay like we all do, the moments right now in the beginning is when you should be generous and willing to do a little extra work to share with the community and developers so that version 1.0 is something that becomes so popular you can get the full kit for that <$100 dream.

Run on sentences aside, don't hate, proliferate!