Well its hard to just pick one but at the half year mark my favourite steels of 2012 are:
American Gangster DE - One that no one has really paid attention to because it lacks inside and back art but the cover art is just awesome.
Blow CA - amazing embossing and back art IMO
Safe House UK- again amazing debossing and overall art
Underworld Awakening CA - has amazing art along with that glossy finish and possibly the best inside art of all time with the "bling" effect even inside the steel
John Carter CA Viva - amazing art and detail to the viva
X-Men Wolverine UK - best steel from the Fox UK wave IMO. Amazing art with the "bling" effect
Mission Impossible 4 UK - Another amazing steel from Paramount
Kick Ass UK - Possibly the best horizontal steel with that amazing deep debossing and unique art
Sin City DE - Jessica Alba... need I say more
Hellboy II UK - Amazing steel despite its horizontal orientation. Awesome continuing art inside and debossing outside.
Limitless CA - Amazing art just like ROTF CA.
Warrior DE - Again another steel IMO overlooked but has amazing cover art and inside art but sadly a printed back.