Look at softrooting as a solution to getting more access to your books. You will have problems with the number of titles you have when it comes to sorting. The Nook firmware had a limit of 1275 titles prior to 1.5. I have not yet seen what the limit is with 1.5.
NookLibrary had a limit of 3000 or so with 1.3 and supposedly increased this with 1.4.
You will need to look
here to start.