I've read some very supportive reports of the 28mm f/1.8 AFS IQ. I have the 85mm f/1.8 AFS and I like the IQ and build quality. It feels sturdy as well as light weight. I've heard the 28 is much the same.
The 28mm f/2 AIS is a bit more compact but I'd have to do some research to compare the weights. The f/2 is a very solid lens.
I've had exceptionally good luck with the f/2 on DX and FX and I'm quite pleased to have one again.
Roger It's still, ISO, aperture and shutter-speed, right?