Billings, you beat me too it. As a PPL holder, I still fiddle with FS quite regularly and the PMDG 737NG is almost as much fun as a real PA28!
The default 737 is really a sorry excuse for an aircraft. You'll be blown away by the PMDG model. Also give some thought to the Dreamfleet 727 which is amazing, the Captain Sim 707, the Dreamfleet ATR 72 and the upcoming PMDG 747-400 and Level D 767-300! As you can see, it can become an immersive hobby!!