it'll cost you about $10-$11 per acre (@32,000).  If you add RR to HXX, it'll cost about

$5 per acre.  Most guys here put down a half rate of something pre-emerge then come back with RU and Aatrex.  Figure in all the costs, (do figure in the volunteer corn in beans following)  probably not a big difference in cost, unless you're using ultra-cheap generic RU.  Do that, and you'll probably give up any guarantee money.  If you have weeds that only RU will kill, there's your answer. 

SS