I somewhat hate to be the bearer of bad news, but the problem I am having is that you want to spend too much money. Who would of even thought that could be a problem?
I can find speakers that will consume the amount of cash that you have specified, but I'm not so sure that those are speakers that I would want to have. I mean presumably the goal is to achieve good sound, not consume money.
But beyond knowing you want 'bookshelf' we really don't have much to work with. Are there particular brands that appeal to you? Are there limits to style and design?
I'm just not sure we have enough to work with.
For example -
Here is a speaker that will consume your money and deliver a good sounding speaker in your price range, but is it the best application of your money? I can't be sure of that.
JBL HT% Short Vertical LCR Speaker @ £645 (each?)
http://www.digitaldirect.co.uk/products_moreinfo3/index.asp?product_id=10408
but I ask myself if I would personally be satisfied paying that much money for what is essentially a 5.25" woofer. And the answer is, I don't think so, not when I see everything else that money can buy me.
Now you could go to the dual woofer version of that -
JBL HT4V THX® Vertical LCR Main Speaker @ £745 (each?)
http://www.digitaldirect.co.uk/products_moreinfo3/index.asp?product_id=10409
But then I have to wonder if you wouldn't be just as happy with this speaker -
ACOUSTIC ENERGY AELITE 2 SPEAKERS (PAIR) @ £249.95
http://www.superfi.co.uk/index.cfm/page/moreinfo.cfm/Product_ID/1821
For the money you are spending, you can have anything you want, but what do you want? There are so many great speakers that you could purchase for that money, but there are many great speakers you could purchase for less money. Unless you are truly looking to buy ultra-delux top of the line speakers, I suggest you shop around a bit and find out what appeals to you, and that would help narrow it down.
Right now, I think the question is too general to get people to respond.
Sorry.
Steve/bluewizard