haha it varies for each situation man. do you want zooms or primes?
here's my setup:
5D mark ii
sigma 24mm 1.8
sigma 50mm 1.4
rokinon 85mm 1.4
canon 70-200 2.8L
this stuff isnt cheap, but it'll last you a long time and will give you fantastic images (once you learn your camera)
my suggestion to you is basically the classic NS setup
tokina 11-16 or the rokinon 8mm if you like fisheye
tamron 17-50 or a wide angle prime like a 24/28mm
canon 50 1.8
canon 70-200 f4
pm me if you have more specific questions, id be happy to work with ya and get ya goin