I use
this clipper. It works wonderfully, but IMO it is rather heavy.
I lurk on a professional grooming board and the
Wahl Bravura gets rave reviews for its light weight and performance. Since it's a 5-in-1 blade you might need to get
these stainless steel comb attachments for more versatility.
I've also seen some recommendations on that board for the
Oster Volt. It doesn't seem to be nearly as popular as the Bravura, but it does have fans.
Probably any cordless clipper is going to be lighter than a corded model.
In case you want to poke around on that grooming forum and see what the pros have to say about different clippers,
here's the link.