My beloved 505 was quickly forgotten and gifted away as soon as I brought home my new 650. You will love the sharper screen, faster processing and better use of real estate on the unit. The downside is that you will have to repurchase all of your accessories, none of which work with the 650.
Enjoy your 650!
(Pass your 505 on to someone who'll enjoy it!)
Many a man has dated a new era in his life from the reading of a book.
Henry David Thoreau (1817 - 1862)