I looked at SSDs at Other World Computing. Impressive, though I noticed that they did their testing on laptops rather than desktops, and on Photoshop and big graphics apps which I don't use.
$150 may be a little steep for me. I don't know. I'd like to know how dramatic the difference would be on my particular computer.
How many gigs of SSD will that $150 buy you as opposed to how many you need? That's a real consideration with SSDs.
I've got to think that Apple's push towards SSDs has been designed with cloud, rather than local, data storage in mind.