Hey, Bob. Welcome to the forum. I don't personally own a Hi-Point but a friend of mine does, in .40S&W, and I help him with his "experiments" with the gun. This Pistol Caliber Carbine is perfect in my opinion for an inexpensive weapon for a person on a budget. It digests every type of round we have fed it, except hollow points with a wide mouth, it usually jams every third round or so. We have tried Hornady Critical Defense and Z-Max, both work fine. Our last test round was the Federal GuardDog round. It is a EFMJ (Expanding Full Metal Jacket) and worked like a champ. He decided to go with the Critical Defense rounds. He also bought a Hi-Point pistol (also .40 so the magazines will interchange). Same rounds for it. Any FMJ we feed it runs true with no hang ups. With accessories he decided to limit them. A good vertical forestock and a light was all he has put on it. Currently he is testing a red dot CCO that I let him borrow but he seems to be better with just iron sights. The 9mm weapon I have never dealt with but it should be just as good as the .40. The 9mm does have one advantage that I am aware of and that is the availability of 15 round magazines.
You will need to experiment with your weapon to see just what round it likes the best and then go from there. We have found that the heavier bullets, 180 grains is best, work better out of his weapon. The only problem that I can see on a PCC is limited range (although we consistently "ring the gong" on a 10"plate at 120 yards), it is a pistol cartridge after all, but coupled with a longer ranged rifle (and for someone on a budget the list is still long) you should be able to do just fine in almost any situation. I would suggest a pistol as well for those up close and personal encounters. Just my $.02