@ccurtin - I'd look at which russell has the greatest money flow and then watch correlations between the futs and the index as well as the correlation between various russell surrogates and spy or es
imo, you see lots of commentary about "relationships" between say, gc and 6e, but on an intraday basis they're not really tradable. Again, imo, the introduction of passive commodity funds, like GLD, have a simple algo, give them money, they buy, take your money they sell. The passive funds have broken many of the relationships that may have existed in the past.
If I may be forward and as someone who has done for this for a long time, if you're going to intentionally trade or hold something which can be wildly volatile, I'd try and stay away from the "but it always reverts" ideas some talk about and use stops. I've seen very experienced folks lose tremendous amounts of money saying "but it always reverts". On specific case is a guy who I watched lose his seat at the NYSE and his home during the 1987 crash.