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Theoman, Do you have a budget and/or some idea of what you are looking for in an Lp12, as there is quite a range here in upgrades, options, and expense? The mid-level Sondek Lp12 is a great value in the used market, but not for the faint at heart AND if you are not yet capable of set-up, you will need the help of a local dealer as the Lp12 set-up is a bit tricky to really bring out your moneys worth. All that said, few tables will give you this much sound for your dollar in the used market. (see my thread in this forum that will guide you to an in depth set-up guide)
One thought is whether you have a preference for the Naim Aro arm, Origin Live, or a Linn Ittok or Ekos arm. All are well proven and good paths with a little different flavor of play and that choice will likely determine which way you will probably need to follow suite on power supply and chassis/armboard compliments. Just to muddy the waters a bit more, Grace, Graham 2.2 and lower, or SME arms have all yielded excellent results with more or less time and aggravation.
By the most part you are going to come to a split in the road at some point with the Sondek Lp12, one road leads to drinking the kool-aid and staying to the "Linn path" which is pretty tried and true through out, not cheap. And the other road to God only knows what! Some after market retro-fit like Origin Live and possibly AudioFlat's "RubiKon" or GreenStreet Audio have merit and some of it is pure rubbish, but to each his own. Talk to most Linn dealers and die hard Linn enthusiasts and you will hear plenty of horror stories of jacked up rigs with $$$$ mods that only made the old shoe box sound "better" when stripped off and chucked in the waste bin.
Where I start to part with the Linn doctrine is only in the matter of expense vs. musical value of return... everyone has their limits. The Cirkus bearing in my opinion is an excellent value and affordable. Any less than an Ittok LVII arm (which is very substantial) and you will be limited in cartridge choice and performance. I would offer you one word of advice, buy a pure stock Linn deck, listen to it, than listen some more, and then read everything you can get your hands on, decide on a logical and planned upgrade path and then if you have some money burning a hole in your pocket, go for it.
Happy Listening!