Aye, it's that simple to connect up.
However, you aren't getting the best cost per gigabyte with an SSD, especially with gaming. Obviously its up to you, but most people wouldn't be purchasing a second SSD to fill with games, because the only time they give you any real boost in performance is when you're loading a game between levels (and even then it might only be a couple of seconds). When you're actually playing the game it makes little to no difference at all.
The reason SSDs boost performance so much with an OS is because of the almost non-existent access times, coupled with lightning fast read/write speeds. They're ideally suited for the OS drive, and for applications like Photoshop for this reason. You don't really see the same benefits in the real-world with gaming because most of the action is when the game has loaded to RAM and you are physically playing it. The performance enhancing characteristics only come into play when you load the next level of a game, or load/save game play.
A good SATA 3 1-2TB 7,200RPM disk (my preference would be Hitachi GST) will be a much more cost effective solution.
That said, there aren't any issues with using an SSD with games, so if your mind is set, then fill your boots -- just thought the above would give you the right information to make an informed decision.
P.S. The Crucial M4 SSD is highly recommended, so definitely worth grabbing another, but there are others worth considering. You can use different brands without any issues, which could be handy if you find something suitable on sale.
