A whole series of good stuff here by artists I like who I think are generally under-rated. Mandrake, Barretto (anybody heard how he's doing with health problems?), and Brereton. A bonus is that you don't have to pay through the nose for their art. I like Alex Ross well enough, but I really love Brereton's stylized paintings with their saturated colors.
A friend of mine has a Phantom sketch that he got at WizardWorld Chicago and he can't remember who drew it. He says that there is an illegible signature and the letters MEK on it. I don't have a scan, but does anyone know who it could be by?