Great movies with remakes are the exception. You have to be a great director to make a good remake... or the same director: Howard Hawk made 'Rio Bravo' in 1959 and 'El Dorado' in 1966; the same movie but with different title... Even more 'classy' then.
Most of them only offers the advanced special effects (or color instead of B&W) and no more. With the present scripts-crisis the easy way is to reproduce what was succesful yesterday but it doesn't garantize a great movie.
Great remakes are born from bad or low budget original movies. If you have a great movie don't waste time and efforts trying to improve it.
Red dawn's remake?
Why? It was a Cold War movie at the 80's. As Cold War is over the enemy has to be the koreans... so better making a new movie with a new title.
(...)"Little shop of horrors" (the musical is awesome, I don't know the movie it's based on) (...)
Here you are... http://www.youtube.com/watch?v=tjREysV8dzc