I suggest holding a logo design contest on 99designs.

It's good place to get some professional looking logos for a good price.  Minimum award is $300. I think we should be able to collect that much.

The advantage of using 99designs is that we can access a much bigger pool of (semi)professional designers than by just posting a bounty on this forum.  We will also have several designs to pick from and we can do a community vote to decide the winner.