Both the Seagate and the WD work just fine… and I’ve had to send examples of each back to the factory at least once. I have not experienced any real difference, performance-wise.
Not to harp on the value of SSDs (or… maybe that’s not entirely true), but just because they make such a huge difference: if cost is an issue, why not consider doing something along the lines of what I’m doing, and only keep a project or two (or three, or four) on the SSD at one time, and when they’re finished, move them off to the cheap stuff?
In my experience the performance enhancement has been well worth the cost, and I spent less than a hundred bucks on a drive more than adequate to that task. Of course, my projects are rarely, if ever, more than 20 gigs big.
No more evangelizing from me! Good luck…