Hi Dianne,
I really don't have any idea what the differences are between CS and regular PS since I have PS 7 but I saw this info on the veggie boards and thought you might like to read it before you buy.
ETA: After a little googling, I came up with an rumor that states "reliable sources indicate that Creative Suite 2.0 will ship in March 2005"
As far as features go, "Among the new features arriving in the next and ninth version of Photoshop, code-named Space Monkey, will be the ability to scale placed bit-mapped and vector files losslessly, including the ability to edit the original and have Photoshop update the file; an object-based user interface that will enable, for example, the ability to select multiple layers and perform manipulations across all of them at the same time; Editable Filters, allowing filters to update when filtered content is adjusted; HDR support; a customizable user interface; and a WYSIWYG Font menu.
Photoshop CS 2.0 will not feature 64-bit support, but lays the groundwork for that support, which will arrive with Photoshop 10 (presumably CS 3.0). Photoshop users will also have to wait until Version 10 for the software to use more than 2GB of RAM. Like the rest of the new Creative Suite 2.0 applications, Photoshop CS 2.0 will take advantage of Adobe's new cross-suite file browser, dubbed Bridge.
There have been rumblings that Creative Suite 2.0 will require stricter product activation than previous Adobe products, and sources say this new product activation mechanism could manifest itself in the stand alone version of Photoshop CS 2.0, as well."
Here is the website were you can read the full article
web site
HTH

Sarah