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Another vote for Brigade F&F here. Currently play using 15mm, have had some great games.
I've heard much good about Altar of Freedom. I've got Pickett's Charge lying around and it looks very good; haven't tried it yet. At this point I'm rather sure that Longstreet is my favourite set of ACW rules.
I recommend Fire and Fury 2nd edition. The 1st edition was a tad slow with musketry somewhat ineffective. This caused many players to just charge into melee. The 2nd edition changed this, making musketry more effective, in fact it is much bloodier than the 1st edition.Longstreet was slow, with oddball cards being used by players. Such as throwing a card so a moving unit had to slow down or stop completely. It's really a card game, which our group didn't like much. We played a few games but have dropped it in favor of F&F 2nd edition.