Which blade has given you the smoothest shave in terms of glide?
+1Astra SP has a reputation for being smooth and relatively sharp, and they're what I've chosen to stick with in my DE89. With that in mind, I still recommend a sample pack... just make sure it contains the blades that at least have the general reputation of giving a smooth shave. You'd be quite surprised how subjective this can be, but I'd make sure your sample pack includes Astra, Feather, various Personnas, various Gillettes, and others. Really, try as many as you can, and you'll probably know what's right for you within a few weeks. Ya never know. The blade that many call "mild" or "dull" (Derby, for instance) could end up being what you call "smooth", "comfortable" and "forgiving".
Personna Reds so far.