I like Designer Whey protein. It's sweetened with spenda, and has 18 g. protein and 2 g. carbs per serving with no fat. Comes in vanilla, chocolate, strawberry, maybe others. It mixes well with water or milk and just a fork or shaker bottle, so you don't have to get a blender dirty just to have a shake. Oh, and it doesn't give me gas like egg-based protein powders.
Gah, I sound like I'm selling the stuff. (But I'm not.) It's cheapest from on-line vitamin or bodybuilding supplement stores.