I know people like variety, but....
Running a couple different strains at the same time is way too much hassle, regardless of growing method. Trying to get the nutes right is one thing... but what about all the rest.. the light height, canopy temp, humidity?
Trying to find a balance that the strains can all live with means all of them must compromise and all dont get grown to full potential... and you learn just a little bit about each strain each run, instead of a lot about one strain.
So why not take the time to run one strain at a time... learn a few as well as you can, while at the same time discovering which strains are similar enough to run together?
So the OPs question is a good one, nevertheless. Maybe somebody out there has done the legwork and can save him some time?
I can offer that Northern Lights would do great alongside RockLock. Two squat strains that like heavy nutes and as much light as you can give em. Take the tall NL seedlings because they dont grow very high and take the short RL seedlings because they will stretch more...