I am not clear about you definition of รข"Professional" or "Non Professional" website. To me a professional site will be where you can find a lot of bells and whistles added to it and a basic site will be a site with just the right information:
- About us
- Contact us
- Some recent news
- May be a blog etc
The look could be great for both the sites, which will depend how much you want to spend and the merit of the person will do it for you.
What I would do is, find a site layout/design that I like and then go to Guru.com and try to get it don't cheaper. And you need a referral let me know :) since i haved worked with 2/3 guys from there.
Hope it helps.