http://ssd.userbenchmark.com/Compare...0GB/2385vs2977

It puts (for the 256GB) average user benchmark at 486 MB/s read and 419 MB/s write.

After my very limited research turned up great things, I ordered four of the 256 GB Samsung 850 Evo series, for two drives in RAID 0. The Evo is almost half the price of the Pro, but if I run into the same problems as you I am going to regret not getting the Pro.