Okie Ok.
Disclaimers, i have nothing against any one &/or any third party lenses.
It like more of a personal preferences.
I owned a Tamron 17-50 F/2.8 Di II; Yes it 'cheaper' if compare to Nikkor 17-55 F/2.8, or rather, i consider the tamron a affordable and value-for-$ walk-around constant F zoom DX lens. I also own a Tokina AT-X 116 Pro DX, great value lens too.
Except sigma, which I had numerously heard of the QC issues.
Anyway off-topic...
I'm awaiting patiently for the 28mm F/1.8G, hopefully it will works fine with my D300S...
BTW i saw in BNS , an legend classic, AF 24mm F/1.4D
(ref:
http://www.kenrockwell.com/nikon/2814af.htm)