Kindle Cover for ePub Business Book - looking for a great design

Kindle Cover for ePub Book

This is a book to help small businesses, coaches, bloggers and other 'softer' and creative professionals get more traffic to their websites.

I want a cover for the kindle version. It just needs to be the front, no back or side or 3D images.

Cover size guidelines: at least 800px tall at least 550px wide
I like 800x600 but 800x550 is also good.

All images must be RGB only at 72 dpi.

If you use any white in the background then it MUST have a grey border

I will need the Jpg and the psd files (png, ai etc depending what you work in).

BOOK TITLE
Title:
Stress Free Web Traffic

(this must be BIG so it can be seen clearly when the image is small)

Sub Title: Ten Simple Strategies to Get More Targeted Traffic to Your Website or Blog

(this needs to be on the cover but in small writing is fine)

Author: Evie Davies

(again it doesn’t matter so much if this isn’t that big font)

OVERALL LOOK
I want a simple, arty, modern look.
This is for creative professionals, not the internet marketing types and I want the cover to reflect that.

I was thinking about a graphic-font based cover perhaps with a background image or an abstract design or pattern?
I've attached some examples although I am also open to your ideas. I will give feedback.
On the first one I like the way the words 'stress free' could be big and slightly transparent so the image shows in the background
http://www.amazon.com/gp/product/0470528060/
http://www.amazon.com/Too-Big-Know-…465021425/
http://www.amazon.com/Whole-New-Min…42337911X/
http://www.amazon.com/Making-Ideas-…59184312X/

So long as it stands out on amazon I don’t have a strong preference for colour. MUST stand out and be a GREAT design!
Nothing too dark – not black or dark brown.

Please leave a question if you need to and watch the feedback I give to guide you.