Here is my take on the "Box Finish Strength" number, it just refers the surface prep out of the box.
10 = 4000 wet sand + polish (Qz2 Blue, Recon)
20 = 2000 wet sand + polish (Ascent Pearl, Raptor Attack)
30 = 4000 wet sand (2Cruel, Raptor)
60 = 1000 wet sand (Sigma Hybrid, Thrash, Ascent Solid)
going by memory: 80 = 800 wet sand (TR2)
Sanding a Recon to 1000 wet sand will esentially make the "Box Finish Strength" at 60. But with the Recon having a lower core/cover (47/25) it is not as strong of a ball as say the Raptor P7 (95/96). Now layout and surface prep can bring these 2 balls a little closer together, but I think trying to use a Raptor on dry lanes or a Recon on oily lanes will end up quite unsuccessful. I'm not sure if I explained that very clearly, I guess that's why I don't write for a living.
As far as picking out a ball, just get a Sigma Tour, that thing is amazing.