I have two VA pipes, one VaPer pipe, one for ODF and Irish Flake, and three lat pipes. The rest is just a free for all. Some pipes just work better with certain blends, and you really don't know until you try all combinations. I usually start a pipe out on burley or VA's, then I'll try some VaPers, then stronger blends. If nothing really sings in it, I'll try some Latakia. If that doesn't work out, it goes into general use and I just throw whatever I feel like in there.