Top to bottom
706t or 811 c/t (drilled strong)
503t (benchmark, strong ball)
716c (drilled control)
508a or 300c(2) (I like the pearl, but up to you)
I have the 508a, 503t and 716c. All roll well, and complement each other. The 508a is weaker (even down lane) than I thought, so it fills my lower end spot. The 503t is strong---- its stronger in the back than the 716c, and earlier.
If you can find one (for cheap) look for a disco 503c---- they can be "had" for around $70 new now, discontinued.