Looking for a 3D Printer

[cbale2000]

I've been looking for a 3D printer for personal use for a few months now and figured I'd ask folks here on CD what their thoughts were.

A few things I'm looking for in a 3D printer (in order of priority):

1. Absolutely no proprietary filament cartridges
2. Under $800
3. Large build area (6x6x6 minimum)
4. Preferably already assembled
5. Reliable / Low Maintenance
6. Heated build platform
7. Automatic Leveling / Zeroing
8. Variety of material options
9. Good software / compatible with 3rd party software
10. Multiple Extruders (I can dream, right?)

I had previously had my eyes on the Solidoodle 4 which seemed like a pretty solid machine, but recently discovered the company that makes them went out of business (dodged a bullet there).
More recently, I've been looking at the R1 +Plus 3D Printer, but have had a hard time finding any reviews for it (most seem to be for the previous version, the R1 3D Printer). I was curious if anyone here was familiar with this printer or if there were any other suggestions for comparable/better 3D Printers around the $800 price point.

Thanks!