I brew 2.5 or 3 gallons once a week at least. I have my brewing system down to where I can do a complete brew in under 3 hours, and do it while I'm doing other things. I recently bought a Tap-a-Draft system which uses 1.5 gallon PET bottles that lay down in the fridge with a tap that screws to the top. They are designed for CO2 cartridges, but I force carb the bottles from my shop CO2 bottle, and use a paint ball tank for serving pressure. It's a simple system that works great for me. I often bottle condition part of a brew, and I sometimes also tap some into 1L EzCap flip top Grolsch type bottles for sharing. I pressure these up from the big bottle after tapping to "enhance" the carbonation a bit. I also force carbonate a few growlers (ordinary glass growlers) at about 20 psi...... for sharing.
This means I get to brew more often....... It means I get more variety........ At the moment I have a "steam beer", an ordinary ale, and a saison in the fermenters. I have a lightly soured saison on deck along with my Calliente Whoop Ass IPA, and a Mosaic Lawnmower beer. In bottles, I have a red lager called RAT (Red Ahtanum), a Zythos Pale Ale, and a dark I call Dragline Dark (an array of American Hops). I also have two varieties of my Hibiscus Wedding Lager in bottles.
I have resisted getting regular large kegs so far....... the Tap-a-Draft system will lay down on the second shelf of my fridge. When they come up with a 2 or 2.5 gallon corny with a with a small diameter that will lay down. The system I have seems to be as reliable and simple interim solution. I have no intention of increasing brew size.
H.W.