An SSD will give you a quicker system, but provides very little in the way of added storage space and should not be used for storage -- just the OS, commonly used programs, and frequently used data if you have enough SSD space.
It seems that notebook has the option of getting 120gb Intel SSD along with a 500 or 750gb HDD for storage and lesser used programs/games. IMO it is worth getting an SSD.
If you can afford it, the SSD should be big enough for your OS and your programs. You can redirect My Everything to an HDD for storage.
If you run apps such as Photoshop that do massive amounts of IO and caching, you might benefit from having enough space on the SSD for your scratch files or your entire project, but now we are talking big money.