ACW Rules. Which do you prefer?

I'm resisting the temptation to actually count the pile of shame (or as Jeffrey Knudsen puts it, the Cabinet of Temporal Insufficiency), but I have just done the maths on the two ACW starter sets - that's 12 Union and 12 Confederate sprues in each box, each of which has one commander, 4 gun crew and a gun and ten stands of 10 infantry (which double ranks 2 to a base) That's not counting the box of metal cavalry, ditto of zouaves and dismounted cavalry. That's over 5000 figures, by my reckoning. 

Eep!

I console myself with the thought that a smallish action probably needs about 150-200 on a side, and they are easy to block paint - after all they come in blocks! It's less scary if you call it 500 stands of infantry, I suppose :D

Anyway. A question for my readers: what are your preferred ACW rules? Particularly looking for things around Black Powder scale, so 3 bases per unit (they're 60x20mm bases), and with some measure of friction. I know Epic ACW is intended for 5 bases/regiment, but that gets kind of big on a 6' x 4'.

Currently I have:

• Black Powder
• Altar of Freedom (on its way)
• Pickett's Charge (just arrived)
• On to Richmond

I know there's Fire and Fury, and Longstreet, out there. Any other thoughts?