I think you should go with Bitcoin Stock Exchange (BSE)
... easy to remember:
BSE, isn't that the official term for mad cow disease?
yes. this makes it easy to remember ; ))
it's been more than 10 years since a major outbreak of bse in europe, should be safe to use now
ppl have different/no associations with bse now.
Wasn't there BSE in Canada and US a little while ago?
My suggestion is to keep it professional, too. Something like BitMeister's F1nanc1al WareZ.
Or more seriously,
BitCoin Global Stock Exchange ("BitCoin Global" for short and for domain)