where's all the designers at?!
Mike, its just a bit vague of a post to really get too many decent designers interested ... if you don't know what you want, how is a designer supposed to deliver even close?
As I'm sure you can imagine, designers often get told 'do me up something and if I like it I'll pay you and if not I'll just show it to the next designer as a what not to do example' ...
A good basic start is for you to at least have an idea of what colors you like or a few samples of what you want from designers ... your point 5 scared me away and I'm sure most other designers too. If you can't even give us a basic guide like a color scheme or an idea of what you do or don't like, its pretty certain you aren't going to like or pay for the designs given to you.
What you are basically asking is for freelance designers to research, compose and design for free what you should be paying someone to do or partly doing yourself ...
Here's an article with some basic tips:
http://www.gofuckyourself.com/showthread.php?t=700443
Good luck!