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The other Space Marine lists don't really play very differently from Grey Knights in that you're still fielding an elite army of versatile soldiers; if you're looking for a change a horde-oriented and/or more specialized force (Guard, Tyranids, Tau, Orks) would probably provide the biggest change. If your wife is creeped out by Chaos 'Nids probably aren't the best choice, though.
Tau are an interesting list in that they're not bad, but they're very difficult to play to their full potential. Overwatch made them significantly better, as did the reduced durability of enemy vehicles.
Orks are a relatively weak list since their ranged firepower is pretty insignificant, leaving them to slog across the field through enemy fire to get into close combat; I'd advise avoiding them against enemies playing Eldar or Dark Eldar since they have no good way of downing skimmers.
Guard are a pretty versatile shooting list that can build around firepower (lots of infantry platoons with heavy weapon squads), numbers (lots of boots on the ground), armor (Leman Russes), or speed (Vendettas and Veterans); they're one of the more competitive armies these days and are a good complement to Grey Knights as allies since their range and speed make up for Grey Knights' failings in those areas.
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