I would like a small teapot for personal use, perhaps 4-6oz. Which size would be most appropriate? I'm really hoping to keep the price around $50 or less, though I was initially hoping to buy one or two sub-$25 teapots to get a feel for whether I am interested in spending more. I only really want to brew oolongs this way right now, so I would probably be happy to get one nice teapot.
I'm looking for something very plain. Unfortunately, I already went ahead and ordered a cheap teapot (pictured below, ebay item #320643670643 - can't post link) before doing enough research, and I am not expecting much based on what I've read here. The same seller also carries "hand made" teapots at a higher price. I also checked out the seller "Dragon Tea House" which I know is a reputable vendor based on threads here, but doesn't necessarily carry only high quality merchandise. Most of their teapots are fairly expensive.

e: I apparently missed the entire selection of reasonably priced teapots on Yunnan's site
