I finally broke down and bought a 3D printer. After looking thru way too many options, I ended up with a demo model of the Lulzbot Mini. This was based on good reviews, high-resolution printing, self-calibrating/leveling, self-cleaning, multiple material options, and open-source design and software. (You can even go to their site and download all the info and STL files needed to build your own if you choose to go that way.)
Just purchased last night, so I'll have to follow up with what I end up with when it arrives.
Second runner up was the Maker's Tool Works MiniMax kit (as the MendelMax 3 is out of my price range.) Both look like outstanding printers that will stay accurate for a long time. www.makerstoolworks.com
I still love the elegance of the Delta designs and may eventually build one of those as well.
For now, I plan to print masters for my foundry patterns with it.
Littlelocos Model Engineering
These two are workhorses currently on eBay. (Also runner-ups in my search over the weekend.)
Lulzbot TAZ 3 (refurb from a dealer) http://www.ebay.com/itm/Lulzbot-TAZ-...item4641d6770e
Lulzbot AO-101 (purchased and lost interest) A swarm of these can be seen on the Lulzbot headquarters tour video on YouTube, making bots.