Borg

I have acquired funds for 2 or 3 new cams. I currently have (3) C4's (.5/.75/1) I'm convinced that I should get #2. So inadditoin to the #2, would I be better off building my rack toward the bigger end with a #3 or build smaller with a #.4? I have a full set of nut so I have options in the small dept, but not much in the larger end so I'm inclined to go for the #3.