Mark -
Nice to hear you're happy with the E-80. We haven't seen this series in the US yet.
I too like the 76 keys on my VA76.
Don't know what to say regarding a 2nd board, for I've never owned the ones your considering, but someone will offer their opinion.
Regards,
zuki
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)