It's funny, I love my F90X as much as any Nikon camera I've owned, but the grip sits badly in my hand so is rarely used. I consider the AF on the 650 to be quicker than the F90 though, so we'll see how I get on.
Thanks to all for their help and advice!
Film amateur with a few rangefinders - Leica III, M2/M3, Werra 3 and Zeiss Super Ikonta 534/16 medium format.
Apart from that have a Rolleiflex 3.5F, the odd Minolta XD7, Hasselblad 500cm, a Topcon Super D and an Intrepid 5x4 large format (not the half of it but I am clearing them out, honest).
I do all my own black and white developing at home.