You just made my day. That is just awesome, especially considering I'll only be playing things like WoW and GW2. Much more convenient than being tethered to a USB3 drive, although its a fair bit more expensive for the convenience as well.
The cheapest Sandisk 128GB SDHC cards get around 42MB/s read, which is perfectly fine for gaming, although not quite as fast as the 90MB/s or so you'd get from USB3.