The Listening Chair - What type do you use?

What type of chair do you use for critical listening? I've always believed that one with a low back is best because a high back would alter the sound back to your ears. But I've also realized that comfort also will make ones listening experience more enjoyable. I’m thinking of going more in the direction of chairs replacing my couch and I’m having a difficult time finding ones with low backs that would allow one to seat in for hours at a time. Is low back seating really that important? How many of you in search of the absolute sound have sacrificed a bit of sonic performance for more comfortable seating?