I liked The Grey very much. Liam Neeson is superb.
Regarding the LFE, it was actually quite impressive throughout the movie, especially during the plane crash sequence. The dynamics can be startling, also.
There is a lot of howling wind during the film which will give your sub(s) a thorough workout; not only for output, but for detail as well. A good test would be to listen to some of those strong wind scenes with capable headphones so you can hear the detail of the bass clearly, then listen at your normal listening level and see if there is any difference.