For the four of us I use a cookset with a 1.5L and 2L pot and small fry pan. Mine are lighter, essentially a cheap version of the MSR Blacklite set. Most of the time this combo was fine, there were a few times I wished for a slightly larger pot so I'm considering getting a 3L to replace my 2L. As Staehpj1 suggests I want a bigger pot because we are big eaters and supper ends up being a large meal. I think your habits will determine which cookware will work best for you.
I will absolutely be ditching my 1.5L for a small, light kettle. My old camp teakettle would've worked so much better for the soups, tea and coffee we can't seem to live without. It also weighs a ton so I'm shopping for a good backpackers version. I just realized that if I make both of these changes I will own a lightweight version of the camping cook set we've used for 10 years!