I found an A350 on TradeMe recently for NZ$200... Too good a deal to pass on so, if your in the right spot at the right time, it's not too expensive.
Kdog is adapting his trans controller to work with the A350. The A340 version is around A$300 incl freight to NZ so even with a premium for the 5 speed version I should get it runing for less than NZ$600...
The local importers charge $1200 for a motor (incl electronics) and $1500 for a complete motor and trans package so, as I wanted to buy a controller anyway, the A350 should cost me $0.00 over the A340...!!!
Don't know if there is a performance advantage to be had but if 4 is good, then 5 must be better...
For big hp the A340 has the advantage as they can be built stronger as there are more parts available...