I have a couple combos.
First combo is a SUB-2000 9mm that takes Glock 17 Mags and it has been flawless. Nice thing about having the SUB-2000 and the Glock 17 is the magazine compatibility. I grab the carbine and the pistol and several mags and I don't have to worry about what mags I grabbed. They all work in both.
The second combo is a Ruger SP-101 and a Rossi Model 92 in .357 Magnum.
I like having PCC and pistols as sets. Gives you more options.
I used the information on the Ballistics by the inch website to help me choose ammo that would work well in both the pistols and the Carbines. I tested the ammo I carry myself to confirm my choices, those guys did a lot of work on the site and it is a great starting point to help you choose ammo.
Kershaw Shallot 1840, Kel-Tec P-3at, Kel-Tec PF-9, Glock 17, Glock 19, Glock 26, Kel-Tec SUB-2000 9mm (Glock 17 mag compatible), Maverick Arms 88 Security 8-shot 12 gauge.