Does anyone know how different the r7 460 will be from the r5 Dual beside the price tag and moveable weight technology? Is the r7 460 going to be that much better? I am in the market and can get an r5 Daul with the Aldila NV 65 for $250 and the r7 460 with the ReAx Shaft for $399. Please help if you know anything. Thanks!