to 50 will give bter bokeh as its a longer focal length
i do want a 35 tho' i love that focal length,
to be honest, i doubt anyone but a pixel peeper could detect the difference between a 50 f/1.4 and a 35m f/1.8
if you can afford the 50 f/1.4 "D" i'd go for it, as its a very well constructed lens. better quality than the 50 f/1.8 in terms of build. image quality.. again.. i doubt anyone but a pixel peeper would see much difference.
most people have trouble composing an image, let along worrying about pixel quality thereafter.