I don't have really thin hair, but I do have fine hair and layering works for me. But, I know that too much layering on a person with thin hair will cause the scalp to show.
I think a chin-length "bob" with a part is your best bet. Some longer layers should be added it to give fullness at the bottom and take the weight off the hair. The "razoring" texturizing technique is a great thing to have done. I have it done everytime I get a hair cut. Also, if your hair is dark, that will be more of a contrast to your scalp. Having a highlight will not only get rid of the contrast, it will "rough up" the texture of you hair making it less fine and appear fuller.
That said, overall, I do not think you will find too may great stylists at Sam's, Hair Cuttery, etc. Not to say that some people don't get good cuts there, but let me tell you, there are some people that have really good hair and it looks good no matter where they go and have it done (I know a few friends like that). Also, it is not unheard of that a well-trained stylist will occasionally take work at a place like that if it suits her hours and schedule--but not many.
Where I live, the best "beauty school" is Graham Webb. It costs roughly $8,000-$10,000 per year to go there. These student are taught WAY more than the basics and usually have high-end salons grabbing them up for trainee positions when they graduate. The last 3 stylists I've used have gone to Graham Webb and they can do anything. Another good stylist I used when to Vidal Sasson in London.
When I went to my local-yokel shops here in burbs, the stylists had all gone to the various local beauty academies located in the suburbs. Only one of the stylists even KNEW how to texturize with a razor. She did it but she was terrified and would only do it on me a few times a year. My hair couldn't take it. After 3 years of looking bad with the $25 haircut, I had to move on. Although, some of my friends with better hair, do just fine. I've been real happy with my hair ever since. If you have VERY thin hair, you need a talented professional. That's my 2 cents.