I have used EQ since version 5. I personally would not recommend starting out with EQ5 = EQ 6 was a wonderful improvement and much easier to understand. The only problem I ever had was that there is a limit to the number of computers/installations without having to purchase a new license (we had two computers die within a year!)
I have purchased EQ7 and absolutely love it. I am also sure if you search online, you should be able to find a better price and it will be worth every penny - just remember you have a learning curve with anything new!