First of all try to shorten your list by visiting the manfacturers' websites. Your ability is vital. Some of those skis are not going to match your ability.
Then go to a ski shop which hires/demos some of those skis. Talk to someone knowledgeable and then demo one or two of them. Nothing beats trying them out. They should take the hire price off the skis if you buy them.
Finally remember that the best ski in the end is often the one with 50% off!