If your intention is too sell the bike after a while, I agree with katsup, it is a bad investment. If you plan to keep the bike for a very long time then upgrading is a great idea.
I am more concerned with your mention of nerve damage and the pain in causes wheeling your bike around your building. Does this nerve damage affect your riding? The reason I ask is because lighter doesn't always mean more comfortable and maybe another bike would be a better fit.