ya, reducing noise is good, but capturing moments sometimes needed higher shutter speeds > higher iso > noise. but will it be that visible? when i first started in photography, i was VERY particular about noise. it makes me stupid

as i moved on, i realized that noise's not that crucial unless ur doing commercial/mag/watever that requires the highest level of image quality kind of photography. there's still alot of people wandering on the streets using film and analog. do they care about the grain? not so..because if they do, they'd get a D3s or a D4

if ur shooting events, street, watever type of photography that u cant control the situation, dont be afraid of noise. if the moment is there, then the pictures is good with or without noise.
the picture u said about the noise, i dont notice it in first glance. even after u say it, i took a look again, and i really dont really see such VISIBLE noise. so it looks to me that ur not analyzing the picture, ur analyzing the noise level.
stop obsessing about noise because it somewhat dont really help on improving ur photography. start learning composition, lighting, handling..bla bla
and about the lens, i sell my stuffs cheap2

so if u wan, nid to sms me fast2 n set a time to meet up

sorry ya