Solid state storage is the most important performance component found in a modern system today. Without it, you do not even have a performance system.
In my opinion, the EVO is truly the next evolution in SSD's. To get class leading performance from TLC NAND is a remarkable achievement. Samsung has raised the bar with its EVO series of drives. Samsung has managed to lay to rest the two primary concerns inherent to TLC NAND; performance and endurance.
The EVO's performance speaks for itself. TLC NAND is capable of providing class leading performance when coupled with an emulated SLC layer. Even TLC NAND's endurance is a non-issue in a typical consumer setting. Endurance testing has shown that a typical consumer/enthusiast will likely never be able to wear out the TLC NAND utilized on the EVO, no matter how long they own it.
Right now there's nothing SATA III based that can outperform Samsung's SSD 840 EVO. Running a pair of 500GB EVO's in RAID is probably the ultimate storage solution for the price available today. For little more than the cost of a 1 terabyte EVO or a 960GB M500, you can have twice the performance to go along with all that luscious capacity.
RAIDing two or more drives together provides you with storage that takes performance to the next level and is something I recommend you try. Once you go RAID, there's no going back.