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Highly recommended, easy to learn and quick/fun games!!
I would go with the reigning champion,The Sword and the Flame.
I use (and very highly recommend) Triumph & Tragedy for 1st Afghan, Sikh and Ashanti Wars games, excellent rules, really enjoyable and very easy to adapt with special events/characters depending on how individual you want to make the games.
In one of the TooFatLardies Christmas Specials there is a set called They Don't Like it Up 'Em. This was written for the Sudan but would readily transpose. It's great fun and very easy to learn.You might also take a look at Battles for Empire II.