Hey Rob,
Manual, you would need either a series 2 NEO Manual
or
a 260rs
In regards to the RB26 Conversion, I would be inclined to say that its cheaper to buy and convert. But still I'm not too sure. Better to talk to Stagzilla on that one...
RWD. Now as far as I know you can but cant. So basically, you can convert it to RWD with the attesa controller, but you cannot get it fully RWD. Thats all I know on that one... B)
I hope that helped a bit.
Cheers,
Chris