Which Photoshop CS2 version should I buy?

I am a professional photographer who is just now purchasing Adobe Photoshop. I am very familiar using all of the different versions, but I do not know which one to buy. On Amazon.com there are two different versions of Adobe Photoshop CS2. The first one is entitled

"Adobe Photoshop CS2 [OLD VERSION] by Adobe (CD-ROM - April 28, 2005) (Windows 2000 / XP)"

the second one that you see when you scroll down is entitled,

"Adobe Photoshop CS2 for Windows by Adobe"

The second one is much more expensive. What is the difference between the two?

Which Photoshop CS2 version should I buy?antivirus

The "Extended" version offers more features and is more expensive than the "professional". Not sure by the desription of that is the difference here, but likely could be.