At rock bottom we use a scottish ale strain as our house yeast. There are alot of flavors you can force out of that strain. It will ferment clean (little heavy pitch low starting temp and raise it slowly) or throw some esters if you treat it right (underpitch and let it start high )

As far as attenuation it fares very well. We get our lite ale and dry stout to drop around 1.8 fg, so really you have all the control of that you need based on your mash temp and liquor to grist. It is hardy to high and low temps and can handle high alcohol without a prob. Give it a shot, you may like it.
Shibby
Quaffablitiy Matters.