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One that I recommend is Trumph of the Will. First rules invented by Two Fat Lardies and it looks as if they didn't even proof read them before moving on to something else (none of the game examples, for instance, are actually correct!)......BUT I think they're really well thought out. They capture the peculiarity of civil wars which most rules don't - how morale was crucial and how well-motivated troops could cut a swathe through unmotivated ones. In the case of the RCW, I also like that they acknowledge the power/importance of cavalry in the conflict, altho these rules cover the whole interwar period.They're fairly simple and there are some rules which don't work well - the clunky command/orders system particularly - but they can be dispensed with. Like Contemptible LA they are pretty bloody but they don't necessitate singly based figures (a pet hate of mine for purely aesthetic reasons). The rules are cheap and can be downloaded.