Gaming?
Why get a PS3 if all it is going to be used for is blu-rays. There are cheaper blu-ray players out there which do just as good a job if not better then the PS3.
He will also use the PS3 as a media center.
does it have to be 37"?
PS: B650, B750, W5500 and V5500 are highly recommended. But if you can, try to aim for the Neo-PDP 42" model.