I picked up the 16GB model last night at Futureshop in Canada. Sold my 64GB Mini so cost difference was small. It's definitely faster and the screen I nicer. I never had any complaints with the original Mini so kind of hard to justify the price premium.
I find Itunes actually hard to use. I much prefer to just drag and drop what I want on my device. WIth dropbox I can get pretty close to that. I've had my Iphone for a bit now and it's never been connected to my ultrabook, only time the Mini has in the last while was to jailbreak it.
I honestly can't see why anyone would buy a dedicated ereader if they already own a Mini. When I had my original Ipad I picked up an ereader as I didn't like reading on the original one because of it's size for a long period of time.
I just ordered a XtremeGuard Clear LCD FULL BODY Screen Protector Skin for my mini, I have the smart cover and I though of a case as well but I didn't want to lose the sleakness of the device.
I use Comicflow, I like it. It seems to be a bit of a pain to setup folders/series on it as you can't drag and drop a folder into the Itunes Comicflow app.