What type of car, finish, color, condition of paint, etc. are we talking about? Wax can be subjective like oil, but as a general rule I like these three:
Durability- Collinite 476s. You will not find a tougher wax, and it looks better than 98% of the other waxes out there.
Looks- Collinite 915 Marque D'Elegance. Not quite so durable as the 476 but leaves a deeper, glossier sheen than anything else out there in the sub-2,000 dollar range.
Ease of application- Meguiars Yellow 26. Great looking wax, not hugely durable. This is the only liquid wax I use. If you don't mind waxing your car once a month, this would be the way to go. As noted above, if you're a novice or just don't have the time, this leaves great results for something so easy to put on/take off.