[hikari17]

I'd advocate taking a longer-range view-- both of the design of your site and your relationship with a designer. If you're at all successful, there'll be lots more design work to do. So why not use this small initial project as way to get to know a high-quality designer whose work you'll be proud to see on your site?

Also, though it may seem like the "tweak" you want should represent only 30 minutes of effort, in reality, to produce quality work, the designer will need to spend at least 30 minutes (and probably more like an hour) just exploring what you're looking for with you before they can even get started with the actual design. And a good designer will want to develop several different options for you to choose from. Pretty soon you're looking at 2-3 hours minimum even for what you've described.

Bottom line... I started out the development of our webapp vastly underestimating both the value of and the time it takes to produce quality design. I encourage you to avoid doing the same.