Looks like a fantastic pump to me. Little Giant pumps are pretty fantastic performance wise, and will last you a good long time. The price on a comparable plastic head version is about $120-30 iirc, so it makes sense that the SS version is $20-30 more.
Here's the important bit I'd gleam from grainger's site:
or highly corrosive chemicals (pH 3 to 11) at temperatures from 32 Degree to 200 DegreeF or pressures to 40 psi*.
Wort falls within those bounds; I think it should be OK.
I'd just find the cheapest supplier, myself.