Whats the main things you think about when looking for a designer?
Normally, the main thing to me would be their portfolio and website.
If they had a good portfolio and website then I would look more into them, but I wouldnt think about working with anyone that didnt have examples of their work to show me first.
I think the cost is also important, but not the most important.
I have seen people charging thousands for designs that are so simple even I could do it

I think its always wise to think about if what your paying for, is up to quality and you need it.