finding a company that will produce a high quality, hard-cover book with excellent print quality is a challenge.
I've never seen a sharedink book up close, but their options look pretty limited (2 books and a PDF).
Blurb also has it's issues. Last year I purchased Blurb's "how to make a book example" or whatever it's called, and was underwhelmed. Also, the last time I checked they had still not gotten their print quality up to a high enough level. All the images are semi low in contrast/saturation.
Asuka had limited sizes that all seemed like a compromise for what I wanted, but equal or better quality than Blurb.
You might want to look at Pikto.com (MR used them for at least one of his books). They too have their limitations, but the quality is higher than Blurb and the others. You also have more options than some of the others like SharedInk. I'll look at Pikto again as they're going to add new options, including dusk jackets (may already be done).
There are others too (Lulu, Fastback, et. al.), but no one - at least not that I've found - seems to have been able to put all the pieces together yet. If anyone has knowledge someone new entering the market that offers high quality, good options, and reasonable prices, I'd also appreciate knowing about it.