I purchased through Forum Sponsor
JDMyard - they were easy to deal with, and their price (delivered to my door) was substantially less than from other overseas suppliers - and no surprise GST or customs bills
The PSS10 was the other option I seriously considered - I did a whole pile of research on both, and found that the Öhlins were considered to have the best ride quality (important, as this is my daily driver) while having superior road holding
Brian Goodwin (who has had the opportunity to try pretty much every aftermarket part for every mx-5 model ever made) prefers the Öhlins, and that sealed the deal for me