Why you won't receive many entries:
You're basically asking us to design for spec, so noone serious or who would do a good job of creating your site's identity will take time to seriously consider the design and take it through the design process.
Second, $100... yes it's a portal but at my usual rate that's about 2.5 hours, no offense but between thinking, researching, and deciding, let alone the actual design and coding, I'm not going to get it all done to a degree that I'm proud of within 2.5 hours.