I agree with Las that I chose an overkill PSU, but I did that to future-proof it. PSUs are the one area where overkill is almost always desired, and for those that wish to upgrade later, required if you want to keep the unit.
I have the same Lian Li case for my main rig as well, but I didn't choose it for this because it is air restrictive. Again,
I own the case right now, and it is not good for airflow. It's good for slow flow, but I don't like slow flow. I had to create ducting to cool my PWMs for my overclock. Not that his PWMs would be cooking like mine (dual core and no overclock, they will be fine) but I still like to get the heat out of the case ASAP.
I chose the memory because the motherboard can take higher than 800 (1066) at stock speeds. I chose the brand because they are one of the best budget, yet not budget, brands out. It is more expensive though, and that is a good call there if he doesn't mind the slight drop in performance.
Edit: here is my system, with the case in question.
Finished
Inside
Radiator placement:
I had to use the mesh bay covers to allow more flow. The design is older, not so good for flow, but I chose the case because it fits my radiator perfectly.