i use a 256 GB samsung 830 for the OS and things i need to run fast, i wanted the ssd because of the speed, and i use a 1 TB samsung drive as primary storage, for games and music, i also have an older 1 TB WD blue which is the secondary storage drive for backup and movies. i use the HDDs because of the low price/GB compared to SSDs.
i do look forward to a future of pure SSD random read/write speed.