1) A complete reboot. Note the comment I've made above, and that Smallville is an utter disappointment compared to what it could have been a few years ago, and therefor is not good enough to be considered and origin.
2) An origin movie with Braniac as the sole villian. Lex needs a break, and this would also build anticipation for seeing Lex and the sequel and if the origin move was a big hit financially and critically, an excellent actor could be attracted to the part. Luthor, as well as LexCorp, should get a few name drops though. I also think it is important that Superman save the world, not just Metropolis, in this origin flick. Batman stops the crime, Superman saves the world.
3) A new Superman, one who can act, and not mimic or stand in for Chris Reeve. That is what Routh did. That is bad. We need someone who can act, who looks the part without being a Reeve look alike, and again someone who can act, someone who can act both the Clark Kent and Superman roles, not just one, which would be unlike Dean Cain. I'm still an avid Henry Cavill supporter. He has all the qualities I listed, I dare say a better look than Reeve, and has matured nicely since the days of the casting wars. I liked him then, as well. And I might get a few funny looks for saying this, but if the guy could buff up and with the help of some camera trickery, Ryan Gosling would make a great Superman. He has the charisma and confidence to play Superman, and the down home country charm and niceness to play Clark Kent.
4) After casting Superman, cast solid, quality actors around him. Not A-listers, but somewhat recognizable actors who can slip into there parts with ease and give great performances. This is a similiar tactic to Batman Begins, with the casting of Neeson, Caine, Murphy, Watanbe, Oldman, and then again with TDK and the casting of Eckhart and Gyllenhaal. Hell, Morgn Freeman was the most known to the general population out of all the actors in Begins. And no, I'm not just pointing to those films because there the rave of society, but because that game plan works everytime.
5) Use the post-crisis, Clark Kent as the real person and Superman as the disguise version. You can debate until your blue in the face, and you know what, as far as comics go, you pre-crisis lovers might have a point. MIGHT. But anyway, were not writing a comic, we are making a good movie. In the MOVIE world, post crisis Superman will work better everytime, I bet my one of my kidneys on it. Clark Kent as the real person creates more story telling ability over the course of two hour films, and it connects more with your movie audience.
6) The world should start out afraid of Superman, for obvious reasons. How would you feel if you saw some alien flying around, lifting cars over his head. It would create a good storyline and some welcome change for the movie. And it sets up Lois Lane as the only person who believes in Superman from the beginning, and urges others to give him a chance. At the end of the movie, after Superman defeats Braniac and saves Earth, he is accepted. The last scene could even be Superman's first press conference for the world.