For pure damage output, get Ambidextrous for 5BP and two-fist Super Warhawks with the Increased Cylinder mod; just throw on Personalized Grip to cover the recoil and fire both of them once per Phase.
I don't like dual wielding because of the 'split dice pool' thing, personally.
Except that I'm not talking about dual-wielding, which is firing two guns during the same Action, although I was admittedly unclear on that... it's why I used the more awkward phrase "two-fisting," instead of the Mechanically Significant phrase "dual-wielding".

What I'm saying is that you hold a Single-Shot Warhawk in each hand, and fire them one after the other.
If you fire the Warhawk in one hand during your first Simple Action, then the Warhawk in your
other hand during your second SA, you get to fire both of them every IP and, effectively, double your ammo before you need to reload... and if you need more than 16 (w/ both Inc.Cyl. modded) rounds from a single-bullet-per-action setup in a single engagement, you've probably gone and screwed the pooch bad enough an ammo shortage is the leas of your trouble.
That's a good idea but if I do Ambidextrous that means I need to buy two guns that's more n¥ which I more BP right,
I'm still away from my books and will be sleeping soon
Not that much more Nuyen, though. Warhawks are a measly 250¥ each. That's barely pocket change.