LP12 an upgrade? You're kidding, right? I like the Ittok arm on a friend of mine's Linn, but his rig, even with "better" electronics just cannot compete with mine. Especially since I added the battery option today. There was an immediate and noticeable improvement. Way, way, way more than a hundred bucks worth.
Now the 901 is a different story. If I quit buying other crap (not all audio related) I would have one by now. I was actually going to buy one when the Supatek came available. But, it was just too good of a deal to pass up!
Frank, did you find the problem with the 309? I was looking at a 312, and that may be an option too.
The other thing I'm going to do today is the TWL HiFi mod. For some reason, I have not gotten around to doing it yet.