Hey how's it going everyone!

Glad to be apart of the Fourm. Ihave 2004 pontiac grand prix GT. I wanted to know if someone can help out with a cooling system problem that I have. First the car is overheating and the upper radiator hose is hot and inflated while the lower is cold I did a flush replaced the thermostat. And still over heating. I took it to the mechanic to have a look at and said it possiblily might be the radiator. Not satisfied I went home to do some research online and found out that it might be the water pump... Both are expensive and labor intensive so thought I ask you guys and what you thought...any advice is appreciated