For what you want I recommend the CEL Robox:

http://robox.cel-uk.com/rbx01.html

You will at least need good ventilation for ABS prints.
Don't underestimate the quality of PLA though, they are almost as strong and more flexible.
For a dual extruder that works well for PLA see if you can still buy a Lulzbot TAZ4 somewhere, those are very good machines.