This isn't really an answer to your question, but a suggestion. If you like lugging your books around, would you consider buying a Kindle or Nook? I was adverse to buying a Kindle until last Summer--now I love it. It really feels great just downloading a title instead of waiting for it to be shipped or heading out to the bookstore. The titles are cheaper, and you can get a decent sample downloaded for free to see if a particular title is your cup of tea or not.
I still buy "real" books, but now usually they're either titles I seriously doubt will ever make it to Kindle, or at least not in the forseeable future, or they are books I love so much I want a "physical" copy for posterity. FPW makes that list, and I will start collecting the hardcover first editions of his work after I finish the titles I have on my Kindle, which is almost all of them.
I thought I would hate the Kindle experience, and I suppose some people do, but I actually like it. Sorry in advance if this comment isn't of any value to you, just thought I'd throw it out there and maybe give you a solution to your problem you hadn't considered.