Which version of Adobe Photoshop should I buy?

First, why is CS6 so cheap now online? Is it because 7 is coming out soon? I have LightRoom 4 for my photo editing, i love it.,....but I can't do templates for cards, announcements, etc. So I need some sort of photoshop. I do not know the difference between "Extended" & "Full". I... show more First, why is CS6 so cheap now online?
Is it because 7 is coming out soon?

I have LightRoom 4 for my photo editing, i love it.,....but I can't do templates for cards, announcements, etc. So I need some sort of photoshop.

I do not know the difference between "Extended" & "Full". I don't know why I should consider one over the other.

Can you shed some light on this software?
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