I like to have good DOF with lots of bokeh thus considering to replace my 18-55 kit len... wonder which of the following (which I am more comfortable with the price) would be a good investment... comments are appreciated...
1) Canon EF-S 17-55mm f2.8 IS USM (2nd hand as new over my budget)
2) Sigma 18-50mm f2.8 EX DC
3) Sigma 24-70mm f2.8 IF EX DG HSM
4) Tamron SP AF 17-50mm f2.8 XR Di II LD Aspherical (IF)
5) Tokina AT-X 16-50mm f2.8 Pro DX