Which version of Photoshop is the best?

[debasis]

There were many releases of Photoshop softwares and which version of Photoshop do you think is the best in usage and also in effects

Hi I am using Photoshop CS3 and i am happy with it but the latest version obviously contain some advance feature but i never used the latest version so i don't kn ow much about it.
Thanks.

I haven't used even CS3 version as it requires higher configuration of the system also and moreover without the actual need why to learn this advanced version and previous versions only have ultimate features in it which will take years to learn full

Alensot you are right i am using it because i am working on different types of graphics, e-book and other types of web applications that,s why i need CS3 rather i need the latest version of it, and to learn photoshop completely one need 1 to 2 yrs minimum for getting mastery in it, i have not taken any special course on it but i always play with it and always experiment on each and every controls so i get a basic idea over it.
Thanks.