It's a very sound plan. I'd go with the 60GB drive and try to put your home folder there as well, since browsers place all of their temporary and cache files in the home folder tree. Having them on the SSD will speed up your web browsing as well. You can put your data files on the hard drives for bulk storage.
Here's a video I posted that shows a side-by-side comparison of booting Windows 7 and starting Firefox using an SSD vs. a WD Green drive: http://www.youtube.com/watch?v=cTHX0MqVMss