If you don't know what backtrack is, why did you download it.
If you are still unclear as to what it is, then read the main site, this forum and the wiki.
I guess if you have not got an idea of what card to buy after reading 100's of posts, then perhaps you should try reading them again and perhaps use the search function where you will find all the other posts asking that question. I will give you a clue, there is no single answer that will cover everyone and every situation.
It looks like it is not the site that has overstretched itself.
Constructive help on what, you haven't worked out what backtrack is yet.