The best SSD for the SE/30 is a drive that is made in the stock form factor (3.5") and already has a 50-pin SCSI connector. Indeed, one probably couldn't do much better than this:
http://www.tri-m.com/products/sandisk/ffd35unscsi.html
That web page says they will even supply a SCSI-1 interface upon request. Since it's an EOL drive (and hence, they probably have a lot of dead stock on their hands), I cannot imagine that the price should be too high now days. But one would have to Request a Quote to find out.
