cheaton wrote:Personally speaking, a Gaiwan made of Yixing clay kind of defeats the purpose. For me a Gaiwan would be something I can use which stays "clean" and untainted with which I can sample many types of tea in the Gong Fu style. Perhaps leading to buying a Yixing pot for a certian type of tea which I enjoyed in the Gaiwan (if it's a type of tea that lends itself for Yixing brewing). Remember that Yixing clay is unglazed and will soak up the flavors of the tea you brew in it and impart these flavors into the next brew. Just my two cents....
It's more common to find yixing gaiwans that are glazed on the inside. This gives you the heat retention properties without the need to commit the vessel to a particular type of tea.
I think that a glazed yixing gaiwan is actually probably be the best way to go in the beginning.
SensationalTeas.com has some ~5oz ones that are reasonably priced at $9.50, and
Dragon Tea House has some smaller ones (3-3.5 oz, which I actually end up using more) for $5.
I think that if you actually got a very thin porcelain gaiwan, something thicker (like the blue dragon one, but smaller), and a yixing gaiwan, then you would actually have a
great set for experimenting and seeing how the different vessels affect teas differently. Believe me, you
will continue to use all three as you get more into tea

This will also help guide your future purchases as you find what teas you like the most.
That blue dragon one you linked is really too large. It's going to be very difficult to get good results from something that large without using a LOT of leaf, not to mention being difficult to handle. You can get a very similar one in a smaller size from
redblossomtea.com. You really don't want to go much above 5-6 oz. (You'll see the same size gaiwans labeled as both; I think it depends on whether they measure up to the lid or the rim.)
Red Blossom, Sensational Teas, and Dragon Tea House also have the much thinner porcelain gaiwans (look for the plain white ones). Red Blossom's is about 5oz and Sensational Teas' is 3.5 oz. Dragon Tea House has a variety of sizes, with the 3.5 oz being very inexpensive (around $4). You'd probably be best getting three that are
approximately the same size.