After playing around with both for quite a while at Regent Street (restarting, loading apps, loading data, saving data), I have to say that the difference wasn't great as some led me to believe. This whole "real world" experience of the SSD model being fast despite the erratic benchmarks didn't really hold true in my experience.
In real world everyday computing (writing, surfing, emailing), apart from an occasional pause on the HD model, the difference was negligible. My advice is that unless you need better data security, save the money and buy the HD model. You can always swap the drive later when PATA drives get cheaper and faster.