6 Gimson GR02's 24V in a Heavy. 259 did something simular with 4 high end batterydrills.

I would use them with the 24/1 gearbox, and use them with 6S Lipo. That opens a wide range of speedo's and batteries, as well affordable chargers.

For redundancy, each motor his own Turnegy TZ85. Even bought @BotBitz , it's cheaper than a Vantec. And if reprogammed yourself, cheaper than a set of Victors (£200 for 2 Victors, without P&P or import tax. £130 for 6 TZ85's at HK UK warehouse)