If you are just editing, vacation videos on iMovie, a Macbook with at least 1 Gig. of RAM is more than adequate.  A 17 inch MacBook Pro is for geared to more professional video editors and would be too bulky for a vacationer.  The Macbook can also run Final Cut Studio pretty well, should you ever choose to upgrade to a higher end video application.
	
		
			
		
		
	
				
			 
 
		 
 
		 
 
		 
 
		 
 
		