One note from Anderson's music I wholeheartedly agree with is this:
My needles are new Inventory!
Many individuals are selling old
leftover inventory from 40+ years ago.
They call this " NOS " new old stock,
but there is nothing new about them!
The rubber cracks, the glue turns brittle and
the diamond tip falls off. Old needles are no bargain.
I've only purchased a couple of NOS styli, one from Pickering's sister company Stanton, but neither proved to work well. Stanton advised me that most likely the rubber suspension had hardened with age. On their website, Shure has said that a stylus more than 10 years old likely needs replacement due to suspension problems even if it had never been played.
On the other hand, I also haven't had good luck with after-market styli. Doing a search for the specific Pfanstiehl stylus you're considering, posters at this site have been variable in their descriptions of its performance, with some even finding it not to fit properly, and others finding it to sound decent but not great.
My preference is to always buy new, factory-fresh cartridges and original styli. If I want to save money, there is plenty to enjoy in a cheap cartridge like the Audio Technica CN5625AL, which has an MSRP of just $25.00 (used to be $39, and I thought it was a good buy at that price, too). Like any other cartridge, it needs careful setup and some break-in time.
Some cartridges, like the AT I mentioned, might be too light to use on your Dual without a headshell weight (5.5 grams is the listed minimum cartridge weight to balance in the 1246's arm). I had to use a headshell weight to balance the CN5625AL in my Ittok arm.
If you're curious, there's nothing wrong with trying the Pfanstiehls for your Pickering and/or Shure. I'd love to hear how it worked out for you. Whatever your decision, remember that it's only money, and it's not like it's the last stylus or cartridge you'll ever own. I've always used my turntable enough to need at least an annual stylus or cartridge change, and for many years I bought something different every time just to hear something new. I encourage you to try different things often enough to form your own opinion about you like and don't like about different cartridge brands, models, available styli, etc.
FWIW, I've become partial these past few years to the afore-mentioned, cheap AT. It has a lively, engaging sound without the bright, lean characteristic I hear in their more expensive models (AT95E, AT120E/T, AT440ML). It's .7 mil conical stylus tracking at a bit over 2 grams seems to work great for my collection of mostly 50's and 60's mono and early stereo classical and jazz recordings, and it's perfect for Dynagroove, with a pre-distortion cut in to match the characteristics of the .7 mil conical shape:
"The predistortion phase of Dynagroove—the adding of complementary distortion to offset the effects of stylus tracing distortion—appears now to be based on sound engineering principles, even though the amount of predistortion that is added is predicted on the normal amount of tracing distortion produced by a 0.7-mil stylus, a size that has been generally abandoned by the high-fidelity industry. The IM that results when the predistorted groove is traced by a smaller stylus is, however, still less than that obtained when the same stylus traces a normal groove. This has been proven mathematically and demonstrated subjectively."
http://www.stereophile.com/content/down-dynagroove-page-4
). NOS styli, the D3000, surface from time to time as do the equivalent Stanton styli, the D-81S & D-81 II S. There are also some good generic replacements for it from JICO in Japan but, sadly, not for $25.00. 
