JPY Futures (JY) Brent Thirty Year US T-Bond DJ Eurostoxx 50 DAX Silver TOPIX In no specific order. All are very reliable for structuring trading scripts. GL
I personally think the grains are a bitch to daytrade, Ive had the best success with soybeans but its nothing to write home about. I prefer crude oil. Dont let the big candles scare you, it trades very nice technically. EUR/USD and 10year notes migt also be something that fits what you are looking for.