Yay! Glad you got a good paperwhite. I did notice the little bit more weight too compared to my K3, but it seems more sturdy too. I have my K3 in an medge case that holds the illuminator light so it makes that kindle a lot bigger. My paperwhite is in the amazon slim cover in fuschia. it is sooo much smaller! I can even slip it into my small purse with space left over. Love it!
As to the font I have been using Palatino on size 3. It does seem a little lighter, but very readable to me. Well have fun with your new paperwhite!