I mostly go for variety in brands, nations of origin, shapes, etc. etc. On a few occasions, I've bought more than one example of a particular brand and shape. I'm not as devoted as chasing embers with his Sav 904's, so two of anything is a real commitment for me. I have two 404 yachts from Savinelli, one an unfinished Sav darkened from long ago, and one a Rossi Palermo. I have two Stawell bulldog 32s, one in silk brune and one smooth finish. And I have two Peterson B11 bent brandy/volcano, one a Killarney ebony dress pipe, and one a Shannon. I've actually been to Shannon, though I bought the pipe online. Have you doubled up on anything? If so, what? In each case, I just liked the first pipe so well, the second seemed foreordained. I have a number of straight tapered billiards, but they are from various brands -- BC, Chacom, Benton, Tsuge, Jerry Perry, Jobey, Ropp, and others.