hi thar
So I was at comic fiesta, and i feel my Tamron 17-50 F2.8 on a300
- not that fast under low light
- the bokeh isolation of cosplayers to the busy background not ummph enough

So im thinking primes (never had one) either one below (under 2K)
-Sigma 30mm F1.4 EX DC HSM = RM17XX (Local Warranty)
-Sigma 24mm F1.8 EX DG =RM14XX (Local Warranty)
-28mm F1.8 EX DG Asp =RM11XX (Local Warranty)
- you suggest

*im stinking something that not exceeds 50mm in actual film equivalent
which one do you think best bang for the bucks?
im open to suggestions as well

Currently im into full body shots, which is why i try to go under 35mm APS-C. While I have never tried any of the primes above (only tried 50mm minolta and Sony before), even 35mm on my Tammy feels somewhat restricted in a busy hall. But then again, considering If i were to use this at a private photoshoot session, the distance i need to be away from model to get full body shot is still acceptable.

*I neever considered 'real' potrait lens, so I dont know those primes above 50mm

*putting on my racun filter