For winter I recommend Collinite's Insulator Wax. It lasts FOREVER, and offers a similar shine to Meguiars Gold Class wax. I prefer Meguiars NXT for carshow season, but I use Insulator Wax for the spring and fall.
I wax my father's Corvette with it once a year, since his car is garage kept and only used in fine weather. His car still beads water after a year, it's amazing stuff! Even on an outside car, it lasts 2 months easily, and I wash my car every few days. Most wax only lasts 3 weeks on my car, so this stuff is really great when waxing that often isn't convenient.
The Bottle:
The Car:
