Deborahjeanne,
I feel your pain

I finally went with the Sony 900 last year and can't wait to get a new one this year. I think I'm going to go with the 650 this time because it's smaller. Love the 900 though. And of course people think I'm nuts, "why do you need another reader, didn't you just buy one?". I also just purchased a tablet which has several e-reader applications, including Amazon and B&N. Main disadvantage is no e-ink, but the touch screen is nice.
All of the book sellers (Amazon, B&N, Borders etc) have an app for your computer. I downloaded all of the major apps so that I can get books from all of them and then import the books to my reader after doing that thing we don't talk about here. BTW I love calibre.