Looking for the best all around dual spec classes

[TwistedVeggies]

My goal is to play and maintain two characters that excel in both respective specializations so I can play all four roles (rdps, mdps, heals, tank)

1. Ranged dps with healing OS: Balance/Resto - Shadow/Disc - Ele/Resto

2. Melee dps with tanking OS: Cat/Bear - Fury/Prot - Ret/Prot - Unholy/Blood

If you had to pick one combination from choices 1 & 2 which would you consider to be the best or most optimal?

[Illik]

I would go Ele/Resto and Ret/Prot