Personally, I like the 1st Generation of 737 100's & 200's with the Pencil Jet Engines under the wings, I've probably got 50 or more of those things in my Hanger, from freeware Eric Canyu's models to Tin Mouse to Captain Sims versions to Just Flight Flights models.
I've only got a small few of the 737 600's 700's & 800's with the Big 55 gallon drums dangling from the wings
