If you're hankering for a 50mm, there is not much difference in the optical quality or bokeh of the 50mm 1.4 AF-D or the 50/1.8 AF-D models.
I would look for a used 50mm 1.8 AF or AF-D. The optical quality and optical design of both models was unchanged from 1987 until the present day on the 50/1.8. I have a couple 50 1.8's, both bought used. I payed $40 for the last one.
It is possible to buy an old junker AF Nikon, like a 4004 or 6006 from the late 1980's/early 1990's on
eBay and get a 50/1.8 AF on there. Buy the combo, and throw away the camera. The AF models are the same optics as the AF-D models, which convey focusing Distance to the light metering and flash metering systems. Earlier lenses are AF, later ones (post 1992??) are AF-D on the 50mm lenses, and same with the 85mm 1.8 AF and AF-D.
As far as bokeh goes on 50 1.8 and 50 1.4 AF or AF-D versions--it is BAD. Not a pretty shooting lens,either model. The new 50mm f/1.4 AF-S G on the other hand, is decidedly a better bokeh lens, with a rounder diaphragm,and a pretty good rendering of out of focus backgrounds and OOF highlights. The 35mm 1/8 AF-S G is also a better bokeh lens than either of the older 1.8 or 1.4 AF/AF-D prime lenses.
When the 50 1.4 and 1.8 AF lenses were designed, "boke" was strictly a Japanese concept, and it was a good 10 years prior to the concept of "bokeh", with an h added, being introduced to the English speaking world.