Dual wield 1H vs 1H + Quiver vs 2H + Quiver?

Solution 1:

In general, 1H + Quiver and Dual Wield setups are only worthwhile if the itemization available to you makes them worthwhile. That is to say, if you have access to much a better 1-hander than a 2-hander, than using it instead may make sense, even with a quiver. If you have two of them, dual wielding might even be an option, as there are some stat affixes that will not appear on a Quiver.

That said, thanks to the Archery passive, 2H weapons will generally pull ahead, since a Quiver offsets the normal loss of stats that occurs when using a 2H weapon, the only thing you really give up is the opportunity to equip a shield, and the defensive benefits thereof. But at the end of the day, with items as heavily random as they are, you'll always want to evaluate every weapon individually - don't rule out a hand xbow just because it isn't a 2 hander. With the right stats, it can still be an upgrade.

Solution 2:

The ideal 2x 1H would probably be 1000+ dps, 250+ dex, 11% att speed (ain't realy sure what the cap is), +crit dmg, socket. Add the 15% att speed from dual-wield, and you could dish out some serious dps. You would probably never see the big numbers you see with an 2H, but much quicker attack speed would cover for that.

2H+quiver for pure dps is the most economical choice, since you get good dps, for less money.

Solution 3:

I do fine using 2 1-handed crossbows, can clear anything on inferno. If you choose to dual wield make sure the DPS is close, or the same, as a single 2-handed weapon.