Our SI-2K was used as a backup cam for another SI-2K on an overseas shoot. As it was being hand held on a naval jet boat on the high seas spinning disks were out. Someone found some 160GB "industrial" SSD. They seemed to have heldup better than the cameramans kidneys and cost about as much.
From the limited research I've done there's a big difference between SSDs. Prices for the same capacity ranged from $450 to $3,500.
Farss is correct about SSDs, there is a "big" difference in "density" or large storage vs "speed". The multi-cell transistor SSD offers currently the best speed but is more costly per Gigbyte and consumes a lot more power------ and it does not come on high density ics, like the slower single cell---- so it's designs are a lot more bulky. .
And the rumor is that Intel is about to announce an "consumer" SSD bigger than 80GB also. This is why tapes, mechanical hard drives and optical disks are all on their way out the door. Then again, some airplanes still have propellers.