I use PS 6 and 7 for everything.  We have CS3 at work and took it off because I didn't like it.  The only advantage it has over 6 is the ability to pan wider than the canvas size. 
 
I prefer 6 in some ways because 7 and up all create new layers when you want to make a path/mask.  I have to go back and delete the new shape layer every time I convert the path to a selection area. 
 
My advice is buy an older version, new ones are a waste of money as far as the capabilities  you will actually use.
		 
		
		
		
		
		
		
			
		
		
		
		
		
	
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