I do highly recommend an SSD drive. Makes quite a nice improvement in overall PC speed. Also, if battery life is a concern with your friend, SSDs draw much less power than traditional drives.
In my desktop system, I have a 60GB SSD (a Samsung) for the OS and several main programs. Due to the size limitation of the SSD, I have games installed on a striped standard HD array (RAID 0); media files stored on another drive; and another drive is used for back-up. Within a few months, I do plan on implementing a server with tons of storage, so this set-up will change.
I wrote all this non-SSD stuff to make a recommendation for a traditional HD, if your friend chooses that route. I use WD Caviar Black drives for all of the other (non-SSD) storage mentioned. I have always had good luck with WD drives and I plan on using many, many of their Green drives in the hard drive array for my server.
Paul