I like a round/bowl shaped demitasse instead of the tulip shape. Nuovo Point & ACF are my two standard cups. I find the NPoints to be a little narrower in the mouth (probably due to the thicker walls). Ive seen the tulip ones at a few places - both online and in stores. Not many sources for the bowl shaped NPoint cups. If Im whacking doubles, I prefer not to have the glass half ful (i.e. not to the brim) , so I tend to use a ~160ml cup.
Nuova Point round cups
ACF cups with Vittoria logo (bought from a fellow CS member)
When Im in the mood for bling, from Freedom, prob made in China.
Glass is good for observing both the colour and volume (of crema and black gold), I think I prefer ceramic.