Are you looking for the lightest wheel possible? There are a few wheels out there that are light but are costly... But what did you have in mind? 15's, 16's, 17's? Black, white, silver, gunmetal? Polished lip, no lip. 5 spoke, 6, 7, 8, etc...

The popular wheel these days in terms of lightness are made by Rota. They use many of the popular wheel designs and are some of the lightest wheels around. They range from 15-16" wheels sizes.

There is also the Buddy Club wheel. Not a lot of folks have these wheels, but they're also very light. They're available in 15" and 17" sizes.

These wheels are 17's, but they also are considered lightweight wheels. Velox PG series wheels makes lightweight 17's if you want a larger sized wheel.

If you have some money that's burning a hole in your pocket, you could get a set of Volk Gram Lights. They range from 15's to 17's and come in various colors w/ or w/o a polished lip. There is also SSR Comp wheels. They range from 15's to 18's and is available in various colors as well.