I usually use an MSR Titan kettle with my SP stove and 110 SP canister. To go really light I use a SP 600 with a homemade alky stove, or a titanium bike spoke potstand and Esbit. I have put a narrow strip of reflective tape on the handles of a Ti spork for the kettle, and on a Lexan spoon for the SP 600. Measured from the end of the handle, and used as a staff gauge, the bottom of the tape is one cup, and the top is two cups for each of the respective pot/spoon combos. I just eyeball 1/2 and 1 1/2 cups. The added advantage is that I can easily find my spoon if I drop it in the dark, or if I'm packing in the dark (I like to hit the trail very early sometimes!)
I also have an Olicamp SS Space Saver cup that exactly fits the bottom of a Nalgene 1L bottle. If that cup were Ti, I think it would be just about the perfect size and weight. I tried to email Olicamp to ask if they make the cup in Ti, but got no reply. They DO make what they call a titanium Space Saver kettle, but it does NOT have the same dimensions as the stainless steel cup, nor does it have volume markings like the SS cup.