Any of the LC line is a lateral move from the PF, not an upgrade.
The 43 is far better but I still wouldn't call it enjoyable to shoot, no large caliber gun in that size will be enjoyable. But it's smooth, accurate, predictable and dependable. That would be my recommended replacement to the PF. Law enforcement price on it is right around 300 I think and I believe you qualify under their program.
The 19 is very concealable and carriable with the right holster. I use a Raven Vanguard.