I laughed when I read ron13315 response to this question. The old saying that you get what you pay for comes to mind when I read his answer.
I good website design, especially for a Blog type site can run anywhere from a couple hundred dollars to thousands depending upon what you want. Designing a good blog, that is pleasing to the eye takes a special talent. There is a big difference between a web designer and a web developer.
I have been a web developer for close to 20 years, and I can take a design and write all the front and back end code that is needed to make that design functional. But my design skills are very limited... It takes an artistic person to design a well balanced website. Someone that has an eye for color, contrast, and a look that makes users want to stay and visit.
Designers are unique in what they design, they do not copy existing sites as that would go against there creative nature. They want their design to stand out, be unique and eye pleasing. Much of that would depend on the type of site you want designed for. Let's face it a blog on technology, would look much different than a blog on punk rock or rap music, those would look much different than a blog on fashion design. You need to find someone that you are comfortable working with and that can take constructive criticism. Many artistic people have a problem with criticism, they do not handle it well, again this goes to the nature of their creative ability.
I also have to agree with JohnV, mixing business and friendship normally leads to disaster. You usually lose either the business, the friendship, or both.
Find someone you are comfortable with, in writing list out your requirements and some ideas on how you would like the blog to appear. Have that person make you a couple quick design ideas, narrow down the ones you like and move on from their.
Designing anything is a process, take your time, be candid with your designer, bring your developer into the process after a concept has been agreed on, and determine what would be needed to develop the idea into a working site.
And remember you get, what you pay for. Going the cheapest route normally will net you the cheapest return.
I hope this helps.