The 32GB SSD seems quite affordable to me. Probably the only one I might consider buying for a notebook, given that it's power consumption is as low (or lower) as a notebook HD.
The >32GB SSD's seem still too far from affordable for me.
As far as I see it, on my notebook I need about 128GB with WinXP, and about 150GB with Win7.
But if I'd just be using the OS and programs, and all my downloaded stuff goes on an external HD, XP could run just fine with 32GB. If I'd load the notebook with Win7 or Vista, I'd probably also need a 64GB SSD, to be able to host all my software,games, Swap $ Hibernation file, and personal documents and data; and have additional space available to do some work with.