I was considering buying this for my wife to give me for Christmas this year. How useful is for post processing astrophotography compared to the full Photoshop? Is there any real difference between Elements, Elements Plus & Premier Elements? I was hoping to find a version chart on either Google or Adobe's website. Most of the descriptions seem to be for 'terrestrial' daylight picture processing unfortunately...

http://www.adobe.com/products/photoshopel/