These days, I have been doing Gongfu with only pots. I have moved away from Gaiwans nearly altogether sans when brewing teas of odd shape like some kind of Dancong or some kind of large-leafed tea. I really do think now that pots give more flavor than a Gaiwan could ever, but this debate has been covered many times here.
I am also beginning to think the idea that one tea is fit for only one pot is nothing more than a myth. I have a few really good zisha pots, some of more porous clay and some larger grained, and as long as you clean it well after use, it won't retain any residual flavors. This fact has been backed-up by some vendors I know from Yixing that said this idea was created by merchants that simply wanted people to buy more pots. Now, if you leave some old pu'er in a pot for 3 days, you may have some difficulty getting it clean again, but if you clean up your mess and let the pot dry properly, there is no scent left! All my friends from Taiwan also laugh at this idea.
The Gong Dao Bei (the vessel you pour the tea from your pot into if you have left-over...or pour all of your tea into if you do it that way) I was using for the longest time was your simple, small glass pitchers you can get cheaply at any wholesale market. They usually go for a quarter or something. I always liked this type of glass GDB because you could see the color of the tea much more easily after brewing.
I have been experimenting more with using my other teapots as the GDB and just using them to pour tea with. I think the results have been quite good in many aspects. Pouring from zisha into zisha will definitely keep the heat and it seems the flavors and scents are more robust and pronounced this way. I also have a few zisha cups that I use sometimes but I have gravitated towards these days as well.
Anyway, what do you guys use for your GDB? I suggest keeping it 100 percent zisha! Believe one pot, one tea?