I heard someone sellin his sigma 2470??

gearhead reporting in......
anyway i have a sony a500 + 1680, I wanna buy one lens now already, but not sure for wat...this mostly would be for portraiture , like doing nice creamy, smooth, background bluring for frens or colleagues or even pc fair or even the real portrait shoots, if i ever get to go another one....

i have tought of the few below, but not sure how good....i would like the subjects to be sharp preferbly at wide open and the bokeh/backgroudn to be smooth and uncluttered

50mm f1.8 ~ aiyo
35mm f1.8
85mm f2.8
SP 90 f2.8
70-210 f4 beercan (i think this is comparable to white knight brand 70-200 f4l??)

the above few is what is under consideration lo......

hie bro..yalo on budget, but my budget is rm1k ma so can cover all the above......

the 50mm i have heard from alot ppl they say it could be tight on apsc?? not too sure


also wondering if its wise to get a prime with recurring range that i have??

hi albnok, iwould like to get the STf but its out of my budget and if i am reaching there i think the 84 f1.4 should be sufficiend though........... anyway i did consider the 85mm f2.8 but will the 2.8 be sufficient?? since that i need to 1-2 stop down to achieve sharper picture..... as far as i am comfortable, i have been doing 1-2 stop down for all my cameras to achieve sharper pics....so far didnt dare to use on wide aperture, unless really needed.

hazril, yea i was considering those two. but looks like time to go uncle chin to play n test again??