Best way to use anchor text?

Hi Guys

I have been doing research for a few weeks about the best way to use anchor text when linking but havent had a straight answer anywhere and I have searched allot!

There is allot of talk about using more and more lon tail keywords which makes sense but the problem is my niche hasnt got many long tail keywords which actually get searched for.

Heres my hypothetical example:

Say my niche was "sports cars"

And the long tail keywords I was using were things like "buy cheap sports cars", "get sports cars cheap"

Now this is only an example as I am pretty sure that "buy cheap sports cars" does get search volumes but lets say that when doing keyword research there was not enough data to show how many people typed that kind of stuff in.

My question is, is it better to use descriptive anchor text with the main keywords you are wanting to be found for instead of going after a generic term such as "sports cars"?

I have been looking at some of the top seo companies links and a few of them are using anchor text which is near enough a sentence, things like:

"Search engine optmisation professionals providing top results on Google"

Now with LSI becoming something that is the new way to use the keyword box on your site things are becoming more and more descriptive and I am wondering if things are moving towards things actually being described instead of the same one/two word anchor text?

I can understand why this would happen as it will make th search better quality as if your anchor text says something like "cats" it could mean many things to do with cats but if you have anchor text saying something like "information on training your cat" it shows not only the search engine but the user too what they will find on the page being linked.

I am asking what is working for people? How are you using anchor text?

I do find that the world of seo is a strange place where people do not want to give away their secrets but if someone could just give me a nod that I am going in the right direction then I would be most greatful

Thanks

Mark