I've had no problems sideloading 1,000 books on my regular Nook, so I'm not sure what you mean when you say no ereader will do this.
We tested with a locker containing 2500 items including a mix of samples and books. We also tested with more than that number of sideloaded books. Should work for you.
Thanks for the input. Since the latest Nook update I have FINALLY been able to load my library. What a relief.
Will think about the Nookcolor.