i use an 80gb ssd myself.. i have some leftover space for programs still.
if you have alot of programs or files that you want very quick access to then going with a 120gb ssd is a good idea. if all you want on the ssd are the os, a few programs and maybe a few files then an 80gb is fine.
The consensus is that a 120GB solid state drive is the "sweet spot" for now. Typically users will have plenty of capacity to install Microsoft Windows 7, software applications, utilities, and games. Data files, movies, photos, backups, temporary files, and odds and ends can be stored on a hard disk drive.
I have Microsoft Windows 7 Pro 64 installed on my ssd. After doing all the updates, patches, and fixes it uses about 22.5 GB of space. Other veterans are reporting similar results. We did a few space saving tweaks to limit the size of the OS. For example, regularly scheduled backups are stored on a hard disk drive instead of the ssd.
photonboy - Sounds like you didn't do any of the space saving tweaks.