You can download a free trial for PS and try it out. I did that after knowing my way around PSE, and felt like it was just too overwhelming and unnecessary for what I want to do. I have no interest in designing and selling my own digital kits. If you think you'd like to try that sometime than you need Photoshop
CS2Some of the features in Photoshop CS2 that are not included in Photoshop Elements 5 are:
* CMYK and LAB color modes
* More tools and features that work with high-bit (16-bit and 32-bit) images
* Combine multiple exposures to create high dynamic range (HDR) images
* Channels Palette
* Recording custom Actions (for batch processing)
* Adjustments: Color Balance, Match Color
* Layer Masks, Layer Comps, and Quick Mask mode
* Smart Objects, Smart Guides
* Lens Blur Filter
* Vanishing Point Tool
* Pen tool and paths palette
* Some adjustment layers (curves, color balance, selective color, channel mixer)
* Editing History Log
* Text on a path, advanced text formatting
* Advanced Layer Style manipulation
* Advanced Color Management
* Advanced Web features and ImageReady (rollovers, slicing)
* Customizable tool presets, keyboard shortcuts, and menus
* In the features and tools that are shared, the Photoshop version usually offers more advanced options for fine tuning and control.
Although these features are not natively supported in Photoshop Elements, some of them can be simulated through other tools in Elements (layer masks and quick mask, for example), and some are actually there, but hidden and only accessible through actions created in the full version of Photoshop.
You can read more at
http://graphicssoft.about.com/cs/photoshop/f/elementscompare.htm