It depends on how you define "the best"; And really, it all comes down to personal opinion anyway. I'm currently the most intrigued about the Cobra, and also the BliSS and the AC9- They all seem to have a lot of fans lately, especially the Cobra, which makes
sense: It's Titanium, has a pop-top style top cone, an engraved glass
tank, and an awesome coil base layout. The Ti BliSS will be very similar and will have (edit: almost) all of the same features, even a similar base layout. And, of course, they're both very expensive. And then, you start looking at the hybrids out there...
But they're the kind of atties you dream about, lol.