Photoshop, 3DSM and typing of viet using IME questions.

I was thinking about investing in a new Photoshop, and 3DSM, because I realised my Photoshop 4 is a bit outdated, and my 3DSM 2 also. What's the newest Photoshop version available? I've heard 7 is the newest, but I've read something about a Photoshop CS or something, which is supposedly newer, but apparently does not have a version number to compare with. I'm confused and not really uptodate with such things, hence I would appreciate a little help on that front.

About 3D Studio MAX, I've read soemwhere that version 5 should be better than 6. Can anyone confirm this?

Also, I want to write vietnamese using IME, but I'm not even sure it's possible, and the Microsoft homepage doesn't mention it at all. Of course, I have different alternatives, but it'd be less messy if I could type every character through IME, instead of using different software for different languages.

I have photoshop 7 at home but I think photoshop 8 just came out :/. Photoshop 7.0 is good. I like it and it was easy to figure out if you are using PS 4, its basically the same but with way more stuff. xD

Photoshop CS is Photoshop 8, yes.

>>> yeah, If you have money to buy expensive software go for it and upgrade everything..