I'm planning to start trading equity index derivatives soon and I'm wondering what's everybody's opinion on Russell 1000 futures on EurexUS. I like the Russell 1000 because it has a 99.7% correlation to the S&P 500 and much better margin requirements and commissions. I'm no day trader, I'll be holding the position for at least a few days to maximum a few weeks. So would their be any downside for me to trade the Russell 1000 on EurexUS over the ES on the CME? Thanks guys.