I think it's pretty solid. One small nit-pick though... you are using purple as a link colour. This goes against the universal browser design language (i.e. purple link is a visited link).
In one context someone might have paid a few thousand for this design. In another, a few hundred. It is valuable as a solution to a problem, so asking how much it is 'worth' is like asking the value of a chess move. Again, it's all about the context.
What I can say is that I know of designers charging AU$50/h for work of a seemingly similar quality.