Book Cover Design (UK Preferred, will consider overseas if Exceptional)

I'm looking for a very innovative and original cover design for a book.

I'm the author, and am self publishing the book.

The Title is: DIAGONAL LENGTHS.
The sub title / strap line is: RETHINKING OUR WORLD.

I've been working on writing the book for the last eighteen months, but been wanting to write it for a few years. I had an image but have had feedback that the cover looks like a computer book. So I need to urgently change this and get a new cover designed.

The book covers Politics, Religion, Trade, International Institutions, Public Sector, Capitalism, Race, Global Warming, Happiness, Work Life Balance etc and tries to rethink our world. Its innovative in its approach, and is completely frank and honest, pulling no punches, however is positive and comes up with an agenda for change. Basically its trying to analyse and examine how we can change and improve the way we work, live, play, worship etc The title can be interpreted for Thinking outside the Box i.e. being willing to be innovative and creative.

I need the entire graphic to be fully done by this Friday ideally, Or at a push Saturday evening coming. That then leaves Sunday to review and ask for any slight changes or amends. Am NOT after the cheapest bid, am really after the most creative one, and am after quality in concept. That said I am funding it all myself.

I am going to get some PR as well for the book, so if it takes off, then would be good to have in your portfolio.

I am in the UK time zone, so would prefer someone in UK if possible. Means can talk on phone. But willing to consider outstanding ones from outside UK too.

The key is that the book is very original, and innovative, with lots of new thinking, and am looking for a design that will convery it.

My preferences are for minimalist designs, but clever intelligent ones i.e. thoughtful. Hope that helps.

PS: The design is to be one image, containing Front Cover, Spine and Back Cover. But the back cover will have some text on it as well but that text will be put in place by the printers.