Savalette guardian with image mag in the smartgun camera, flashlight on the side rail, gas vent 3, personal grip and a powered folding stock. plus a quick draw holster.
Extra range of the heavy pistol combined with image mag helps to deal with range modifiers, packs a decent enough punch, has plenty of recoil comp for weaker characters too.
Other than that, the classic handcannon of the ruger superwarhawk is hard to beat. can punch holes in most things, especially with APDS loaded. Yeah there's no SA burst on it, but if you're a combat adept, you're hitting high dicepools anyway.
The real question here would be "what's your favourite light pistol?" thats a class I see totally neglected on charsheets posted here and in the recommendations from the usual chargen thread contributors.
For me, the fichetti security 600 is hard to beat. cheap, accurate, powerful, 30 round clip, integral laser sight + folding stock. stick an internal smartgun + vision mag on it, silencer or gas vents to taste and a nice holster too and you're away. its concealable and good for sustained firefights due to ammo count and packs enough of a punch with APDS that heavier enemies will have to worry about it.
cracking sidearm or primary for non-combatants