What's the optimal size of a moka pot for a single espresso? I'm new to brewing coffee. All I'm after is a single espresso in the morning. Sometimes latte.

I've recently got myself a 6 cup moka pot - the smallest one we had in a local store. Doing it by instruction gets me a full pot of something in the middle between filter coffee and machine espresso. A bit watery to my taste. I like it stronger. So I use hot water and cut the extraction short - as soon as it starts bubbling - pot gets cooled. Like that I end up with about 1.5-2 cups of espresso with a stronger taste just a tiny bit bitter, just the way I like it. A bit wasteful though. 

Then I bought a 1 cup pot, which is much smaller. The extraction process runs smoothly and ends up quicker. The bubbling phase is very short and happens at the very end. It doesn't dilute the result much. I get exactly 1 cup. The taste is just a bit weaker than what I get from the 6 cup one.

This is strange, the volume is 6 times less, but the end result is only half smaller. I'm looking for a happy medium, probably should go for a 3-4 cup or 2? What would you suggest to pick for a single espresso?
I figured it out. I bought a 2 cup Bialetti Brikka. It's a moka pot with a special valve. The main purpose of the valve is crema formation. It's also a bit easier to use than a regular moka pot:


It is designed to start with cold water. Just use the exact amount (there is a measure) not more, not less.
It streams coffee for only few seconds and you don't have to play with the heat intensity while brewing. 
The brewing occurs at higher pressure and temperature - thus stronger coffee.
And yes, decent crema!


I get exactly one full espresso cup of strong and nice tasting coffee.