So I want to get my parents their first digital camera for their upcoming vacation. i've narrowed it down to the cannon sd500 and the cannon sd20. sd500 = 7.1 megapixles while the sd20 is at 5. sd20 is a lil over $100 cheaper. a lot of complaints on the lcd for the sd500 though, i guess they're super fragile. Which one do you think i should get?