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I'm quite happy with bookscan.us. They charge far less than 1dollarscan -- when I have a 250 page book directly shipped to them from Amazon, it costs $6 with 1dollarscan, and $1 with bookscan.us. They scan 300 dpi b/w, while 1dollarscan scans 300 dpi color. For OCR, this makes almost no difference. 1dollarscan's color-scanned pages, when read on a screen, are easier on the human eye, but the bookscan.us b/w files are much smaller, like, 15 MB instead of 150.
No matter who does the scanning and who does the OCR (I'm doing this myself, with Abbyy FineReader), after OCR you'll have to do a lot of proofreading and editing to turn the output into a reasonably error-free and reasonably well-formatted e-book.
If you want to read the scanned PDF "as is", you'll need a device that can handle them, and you may find that the quality of the images is not always perfect -- some pages may be skewed or warped, though usually to a degree that can still be handled by the OCR (except for color vs. b/w, I've found no big difference in scan quality between 1dollarscan and bookscan.us).
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