I wouldn't really consider the raptors as a choice anymore. If you need absolute speed then the ssd seems like the best option, if you do have a need for more space i would probably go with any standard 7200 rpm drive rather then bothering with the raptors.
The Raptors are ideal for scratch drives as they are fast and have capacity. It is a niche they fit into well. For just about anything else I would use 7200 RPM drives and 5400 RPM for external drives.