This fall I plan to get a second SSD to store my precious documents, family pictures and work files (+ a game or two if it doesnt comfly fit on the OS ssd -a 128gb m4).
I'm not sure which parameters are more important for such use, besides reliability.
I can guess usage will be 80%+ random read, so something between the gaming and the productivity setup in this review (scroll down):
ATM, I'm debating between another crucial m4, or the new samsung 830.
Pricing in EU should be about the same for the 256GB size.
The lower latency of the samsung probably makes it a winner.