If you live in US and want to trade Asian markets Interactive brokers are your best and probably only choice.
I was trading Hang Seng for some time and now back to DAX. Hang Seng is very thin, and recent volatility made spread to increase to a point where I could not trade it since I had to dramatically increase my stop losses.
DAX is great, the major draw down for me wake up call at 2:30 am. For those interesting in DAX, do not bother trading it 1st hour, not much going on until stock market open at 3am (EST).