Morning Sui
If you have all the wires in place already i’d use them, it’ll work out cheaper as your not paying for the wireless tech. However if youare going to need the odd wireless sensor it can start to work out more expensive to have a hybrid system (can’t beat a wired bell on any sytem tho). Look at Pyronix, Enforcer for wireless or Euro 46 for wired. Both use the same app.
Re the CCTV if your going to install it your self you can get a lot for your money using Hikvision equipment, personally i fit the 5 megapixel POC (power over coax or cat5)range of cameras and dvrs. A little thought in to running the cables in for the system and you can have a very nice neat system.
If your looking at combined alarm pirs/cameras take a look at visonic equipment.