I would go with a medium moderate as a second rod, something more parabolic in response. This allows you a very wide range of action for different techniques with just two rods. Length should be considered too, but that should be a different thread IMO.
I would experiment with which reel to which rod, it would depend on how you fish each rod, and how it feels to you. As a start though I would go with the 6:1 on the medium rod this would help when cranking, IMO.
Back when I was buying my reels 7:? reels were just coming out and the 6s were the standard for a long time, so I'm a little biased towards the slower reels. I also don't fish Bass like I used to, so I tend to gravitate to lower geared reels now for the winch factor.