I use to have loads of lenses, old manual lenses, 3rd parties, etc.
I sold them all, and now have exactly what I need and no more (all Nikkor):
24-70mm f/2.8
70-200mm f/2.8 VR2
85mm f/1.4G - that lens is the most important in my bag.
I also have the cheap 50mm f/1.8D, I don't use it much but it's so cheap, small and light that I have no reason to part from it.
The three lenses above cover all my needs. I often toy the idea to get the 14-24mm f/2.8, but wonder if I'd use it as much as the others. And of course, it's an expensive lens!