AF-S just means Silent (*i think*). What you need is for the lens to be IF, internal Focus. Off brand's may use their own term to mean 'IF'.
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Headphone setup:
Audigy 2 ZS > MHdt Labs Havana NOS DAC > HeadAmp GS-1 > Sennheiser HD650
Home stereo setup:
Audigy 2 ZS > MHdt Labs Havana NOS DAC > Denon AVR-685 > B&W 603 S3
Portable Audio:
Ipod Nano > Head-Direct RE2
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