Here are a few I’d like, as I think I’ve said before:
1.) A version of A Connecticut Yankee in King Arthur’s Court that didn’t wimp out, wasn’t a star vehicle, and managed to actually capture Twain’s off-kilter wit.
2.) I, Robot done faithfully to Asimov, ideally using Harlan Ellison’s script (and lots of CGI)
3.) Heinlein’s The Puppet Masters done in its proper period setting, with a good sense of the proper eeriness.
4.) This Island Earth done by someone who’s actually read the book, and without the exposed-brain Mutants, a destroyed Metaluna, etc. They can change the ending, if they want – it was the weakest part of the book, but a version that actually explained the meaning of the title (and why that’s important) would be good.
5.) H.P. Lovecraft’s The Case of Charles Dexter Ward. done straight.
6.) Fredric Brown’s Arena. I’ve filmed this one in my head. It has to be one of the most ripped-off stories ever, with Star Trek and The Outer Limits strip-mining it, but the original story , especially with modern CGI, would be great. Bonus points for filming it without having recourse to voice-overs.
Just about anything by H.G. Wells, Jules Verne, Edgar Allen Poe, or H.P. Lovecraft, in fact. Just about everything based on their works has changed them so completely that the point and the feeling are lost. In particular I’d like to see:
7.) The Time Machine by Wells, done so that you not only had the far-future scenes that no version has included, but also making the point about what the Eloi andf Morlocks really were. If you think the Morlocks are subhuman monsters preying on the wonderful Eloi, you’ve missed the point completely.