Okay so first off 256 will be enough for what I plan to do, I think. I want my os and applications on the ssd and everything else on my hdd. I do video editing if that means anything, but I keep all of those files on externals for numerous reasons, and this wont every change. I'm getting the samsung 840 pro, already decided on this too haha so mainly what I'm wondering is, is there a read/write difference between the 256gb model and the 512gb model and will I notice it/ is it worth the money. the 256 wont even be close to 1/4 full based off of my projections. But money isnt an issue if it is needed as im going to maximum performance. thanks!