Its decision time Folks

I have read and read and You Tube but based on previous experience I still cant make a informal decision,So Im
asking my fellow Nikonites for advice

My problem is to choose between

Nikkor 70-200mm f/2.8 mega expense but top notch gear (I am a hobbyist)
Tamron 70-200mm f/2.8 (show some love) Its slow focus but tack sharp,better than some Sigma's perhaps
Sigma 70-200mm f/2.8 OS HSM and the Non OS mixed thoughts on this one

I am armed with a D300

I gather all the good points and bad points its just that the hit and miss ratio with the Sigma is a worry to me as my last copy in Pentax Mount left me wondering
as why spent the dollars and not getting tack sharp wide open @ 200mm

Thanks in advance

cheers