Pretty sure that my latest upgrade is a significant one and does offer an extra 5m of depth along with GPS and several other features. Won't help me get better photographs but should allow me to get closer due to it's longer zoom. The D800 I bought a while back offers more pixels, allowing me to crop in to gain extra apparent reach. I do enjoy the gear aspect of the hobby to some extent and am very lucky to be able to indulge my GAS, however, I'm even luckier in that I have pretty much everything I want or need (until the next whizzyfandangulator comes along!!!) Luckily I also have a pretty good idea how to use the kit I have - I'm under no illusion that I'm a fantastic photographer but I can (and do on occasion!) get some corkers.
He who lives with the best toys has won, he who dies with them has lost.