The NewCon Press anthologies always contain a strong list of authors whose work I admire and would want to read myself, seasoned with a liberal helping of new, undiscovered or lesser known writers of real talent -- part of my whole intent for NewCon Press is to promote new voices who I think are good enough to deserve a platform.
For example, Conflicts, the anthology I pointed out to FE earlier in the thread, has stories from the likes of Neal Asher, Eric Brown, Andy Remic, Keith Brooke, Michael Cobley, Martin Sketchley, and Edge Hill Prize winner Chris Beckett, as well as newcomers such as:
David L Clements: a London based astrophysicist for whom this was his first professional sale. Between my buying the story and the book appearing, he sold to and was published in Analog.
Martin McGrath: another really talented writer with a couple of webzine sales to his name but, again, this was his first professional sale
Plus less well known writers (though not entirely new) such as Rosanne Rabinowitz, Gareth L Powell, Una McCormack and Jim Mortimore...
I agree entirely that bringing out hidden talent is a worthy goal, but to do that, you also have to provide stories by authors that buyers know they can rely on. It's all a question of balance.