I think the criteria for a 'purist' is going to be different from a casual player and that ergonomics, especially the control surface, is very, very important. Example - full set of drawbars. The controls on the KeyB is about 98% accurate to a real B3, the differences being a few enhancements such as a transpose button or a control to link pedals and lower manual.

Also, I wouldn't dismiss the Hammond so quickly. The biggest knock on the Hammond is the PRICE. The TOTL Hammonds are probably the best of the lot. Just be prepared to mortgage your house .

chas