1. Concorde: By far and away the most graceful airliner ever flown. I've seen it up close and personal at Oshkosh and it's amazing. For pure speed and beauty, it's number one.
2. Lockheed L-1011: The first airliner to ever make an entire flight electrically flown by computers. Swift, quiet (for the time), good looking, and comfortable, it's the best of the non-glass cockpit airliners.
3. Boeing 727: Once the world's favourite airliner, the 727's sharply swept wing and long, sleek fuselage (3 inches longer than the 707) gives it that certain "presence" that modern, more efficient short haul airliners lack. Not to mention that it can fly out of nearby Pryor Field at max gross thanks to its 26 flap system (which is said to be utterly reliable).
4. Boeing 747: Boeing took a big gamble and it paid off beautifully. The 747 IS the Jumbo Jet. The largest airplane plying the skies, watching one takeoff is like nothing you've ever seen.
Not really in any particular order:
Canadair Regional Jet
Fairchild Aerospace 323JET
MD-11 (kudos to McDonnel Douglas for staying with the trijet)