As far as I can remember, I have:
SME 3009 II (several, on different TTs)
SME 3009 III
Pioneer PA-5000 (For PLC-590, which originally had one of the SMEs on it)
Garrard TPA10 (Added as a second tonearm to a Garrard 4HF)
SAEC (Can't remember the number, and its in storage so I can't check it.)
I've also swapped out my GT-2000 tonearm for another one with the optional arm-lifter already built in (in other words, an arm equivalent to that on the GT-2000L). That left me with the original tonearm to play with as a separate.
Toyed with getting a few others (Morsh, Infinity Black Widow), but didn't/haven't ...at least, not yet, and I may not, as there are other and higher priorities for now. The one I'd really like to find (at a remotely affordable price) would be the SME 3012.