Sheet-feed scanners

Thanks for your reply on a subject that I have an interest in :-). I have some books that I use in my work that I would like to scan (for personal use) to put on my laptop, to make it more convenient to carry around. I have about 20,000 pages that I would like to do eventually. Here is my question. I am trying to figure out what would be the cheapest way to get them scanned or to do them myself. I don't mind buying a scanner. I already have a very fast computer. So....what I would like to know is what type of scanner should I buy or rent to do the job and what software do I need. I have all the Adobe Acrobat stuff already. I called one company and they gave me an extremely high price to so the scanning for me, and insisted that I tear all the pages out of my books, so they can be fed into the auto scanner. I prefer not to do that. What I need is a fast scanner where I could do several hundred pages at a time, each day until I'm done if it will save me a ton of money. They wanted something like $.08/page. I figure that I can buy a nice scanner much cheaper than paying all that money to have my stuff scanned ($1,700.00). What would you recommend, please? Thanks, -Dave