It sounds to me more like a loose or corroded cable connection...they'll do just what you describe, you turn the key and everything goes black.
Take all the cables off, clean them and put them back together before you run out and buy anything. Do both ends of each cable. I have one of those little circular wire brushes specifically designed for cleaning battery posts and cables, they work well and cost only a couple bucks.
Sometimes the corrosion isn't apparent even after you pull the connection apart, so make sure all the connections are nice and shiny including the battery posts, and put a LIGHT film of grease, copper paste, antiseize or something similar on everything to inhibit further corrosion. If any of the cables have those bolt-on battery clamps from the discount parts store, toss 'em and get a whole new cable/clamp assembly.
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