I don't want to waste hard drive space on my MBP's hard drive on games. I have a 16GB SSD ExpressCard as well as a FW800 external hard drive. Which would be optimum for playing games off of (considering that a game will need a fairly high read/write speed to keep up)? If the FW800 drive is better, how much better? Would I notice a difference if I used the ExpressCard instead?