They are all rare.
You know well. It is wonderful! [] ]'>
The TokaMac II FX I have, but none of my IIfx motherboards were modified for it to work.
The performance/040 I almost had my hands on two of them but the owner ended up tossing them (stupid wife) before he could ship them, he had to move in a hurry. I read that they were very slow anyway.
Never got close to getting the Data Cannon for the IIfx, but I do have the Quadra PDS version of that card.