iPad vs Physical Books vs nook

I've enjoyed the iPad so far. I've had it for a few weeks and I have read an entire book on it, virtual cover to virtual cover. Some people prefer the nook or Kindle because it isn't backlit like the iPad, but it hasn't bothered me. Mainly because I use it more than my computer at the moment and it is easy to read on, in my opinion. But comparing the readability on the iPad to reading an actual physical book and what I know of the nook is the reason I'm writing this.

VS A "REAL" BOOK:
This is where it gets me. I LOVE having an actual book in my hands. I like being able to display them if I buy them. I do browse book prices on the 3 applications I have; nook (Barns & Noble), Kindle (Amazon), iBooks (Apple) and compare to the in store price and/or Half Price books store if I'm in Pickerington (which is rare anymore). I bought Sworn to Silence at the mall bookstore (Walden/Borders) for $8 (paperback). The sequel Pray for Silence just came out this summer and was $25 (hardcover) new. It was in the iBooks store for $11.99, but this is where I prefer the real book copy over virtual (even though virtual is great if there were a fire, but I don't have the money to have ALL of my books virtually) because I don't want to break up the series. I found Pray for half the new hardcover price and it was only a dollar or two more than the iBooks price, but I made the exception because of the series.

VS NOOK (what I know of it):
I do not own a nook, but my mom bought one when I was down there last. The readability is similar to that of the Kindle, which she was contemplating buying. She went with the nook and likes it. You can lend out books (only certain ones) for two weeks but only one time. Which is ridiculous because she bought the book. You also can get library books too.

OVERALL:
I enjoy the iPad, but if it's a series that I already physically own I will continue that. I also would like to see a library application. I'm sure that will be in the future, but until then I will enjoy a bit of both options.