Well, at the same hand, you are missing options such as hybrid drives (Seagate Momentus XT) which are standard hdd's which use ssd's for cache.
Also forgetting RAID.

That is my boot drive.
2xSamsung 500gb F3s running on the controller that came built into my motherboard. Cost me under $100, and performs simmilar to a SSD.
My question is what means of network are you using to send the stream. As Jeffy said, this will greatly impact. Not only that, but what hardware is in the media PC itself and what quality videos are you trying to play on it?