also, do you already have the 550tis? is there a particular reason you want water cooling? a decent air cooler is pretty cheap when you compare the performance of the two options. What case, what water cooling, what motherboard, what HDD, what OS, what specific ram did you have picked out? Or did you need suggestions for all? Agree with Juni, you should be looking at intel if you are planning on gaming, and 16GB is overkill for most builds, especially gaming.