Wil I benefit from sigma 18-125 to Tamron SP AF 17-50 mm f/2.8 XR Di II LD Aspherical

I got a great offer for the beercan to add to my collection.

Then I have
Sigma 10-20 mm F/4-5.6
Sigma 18-125 F3.5-5.6
And minolta 70-210 F4

And stil about 400 euro's left to spend on my Kit

Thought also of the 18-70 2.8 but I see quite mixed opinions on the tamron and sigma. Mostly very soft corners and sensitive for flare and ugly bokeh. But such size would nicely complement I think with with plenty improvement over the 18-125 that I already use

Any suggestions left?

The nice thing is that i can use all lenses on my 580 and my minolta 7D