Welcome to MobileRead.
Two quick points. First, ereader is Fictionwise's name for a format of ebooks formerly called PalmDoc. It is not a general descriptor for ebook readers. There are some people that are fanatics over this so if you could edit your post to change that it would be appreciated. Second, we have a great polling/survey facility built into the forum software. You will get a far better response rate if you use that. I know that it generally only allows answers to one question at a time but I have used it for multiple questions at once with great results. Also by using the forum survey module you will not have to collect the data later as it will be available as the survey progresses.
Good luck with your ebook reader quest.