Remakes, sequels, prequels, reboots are dangerous things. For every Batman Begins you get, you get Superman Returns, Wolverine, The Wolfman, Psycho, etc. Unless you can bring a fresh angle there is no point to any of them.
Some movies should never be remade: Citizen Kane, E.T., Casablanca, Gone with the Wind, Wizard of Oz and I am sure others.
Some can be inventively built upon. The musical Wicked is a great nod to Wizard of Oz without actually being the same thing and from what I am reading of the the Raimi Oz film it owes a lot to Wicked.
Some remakes are as good as the original or better because they are their own film: Thomas Crown Affair and Ocean's Eleven come to mind (though the Ocean films should've stopped at 1, the sequels sucked).
some movies that got remade make me want to punch people. Psycho was a pointless remake and the casting of Vince Vaughn was so bad. horror and suspense seem to be rife with remakes and sequels, most of which are bad.
As for what I would like to see, hmm, that's a little tougher. There isn't a lot I want to see remade to be honest. Attack of the Killer tomatoes perhaps?