CS2, CS3 or CS4. ?

the portable versions dont require much space. works the same as the regular.

I've tried all of them but chose to stick with cs3. As said earlier, cs4 uses alot of memory

I have both cs2 and cs4 :P I always use cs2 cuz im always running alot of programs along side it. that and i really hate the cs4 interface. :/ it really disappointed me.

My opinion is that CS2 is the nicest vers of all,its verry easy and simple

If you have previous experience then use whichever you are most familar with. There are aspects with CS4 which really annoys me, like the automated feature for making contact sheets has changed (you have to do it in adobe bridge now!) and the extraction tool has disappeared, but because CS4 is the version my university uses, I have to be familar with it. I'd say out of the 3 of them though, CS3 would be the best ;)

I use CS4 Portable which is optimized for lower ram users, as me who has 512mb ram. No problem to have many programs running at the same time ;)

I've been using CS2, then pause. I've been using CS3, then pause. And now i am using CS4 and i feel comfortable working in it. Actually i don't really see huge improvements between them, except CS4 interface change, but as i said, after a pause you don't care which one you're using.

CS4 for me