The Ibanez S series guitars are practically light as a feather, and still hold a good note, but thats only if you're looking for a Super Strat body.
As for V's majority of the Jackson RR series guitars are very lightweight and easy to lug around. If you like that V shape then you can also look into the Alexi Laiho (sp?) ESP guitar's. Just use common sense and avoid anything made out of mahogany unless it's a thin body type.