Bulb life is much longer on the 55 than either of the other two, plus there were improvements in other areas. I wouldn't consider either of those choices myself.
2000-3000 hours on the HW50 and 95. 5000 hours on the HW55. When you consider the free bulb with a new one it really isn't too close. If you aren't interested in 3D and are very fussy about image quality the 95 would be tempting for the better lens. That is a really good price.