At first I wanted to run it using the original 1st edition rules, but I've never played that edition and for time-frame reasons (too much to read and learn) I've decided to go with 5th edition, which is the edition we're currently playing. I also wanted to play it as a 1-shoot since we're currently in the middle of another campaign. But some of the players begin to ask when we'll be starting it, and because I've been wanting to run this classic a good 10+ years ago, I've decided to savor the pleasure of having Strahd play cat and mouse with the helpless PCs for more than one session.
And indeed I'm savoring it. Castle Ravenloft it's a beauty and the myriad of paths the players can take makes it really alive. Also the Fortunes of Ravenloft add an extra level of excitement to the gaming sessions (not to mention the re-play value).