Personally my two favourite pots for black teas are a traditional Brown Betty (especially the one person dinky one that sits in it's own teacup) and a terracota, bamboo handled, Chinese style with infuser.

I had a glass teapot that enabled me to watch the 'agony of the leaves' but this was not very good at bouncing and I now just pour water onto green tea in the glass and let the leaves settle to the bottom.