Yes, 20% a year over the long term is very good. I have had 50%+ years but had other years that weren't so stellar. If you want to see how other traders are doing please see this thread. http://www.elitetrader.com/vb/showthread.php?s=&threadid=162253
you are asking the wrong question. the focus ought to be on the specifics of the trade. forget about how much you will make this year. think about how you will execute an elegant trade and maximize your risk adjusted return for that trade.