Although not a Bitdefender fan, its up there with some of the best.
It may not be the lightest, but if you have a decent processor, decent amount of ram, and a nice HD & controller, i imagine the system will be just fine as well as keeping the baddies out !
I would like to add that you have put "no need" on backup and recovery, if it were my choice, i would argue that to the grave with you.
Do you have a local backup ? Are you running a Raid 1 with your drives ? How about an Online backup at least ?
Nothing ? What happens when your computer blows up, your room catches on fire by mistake, or house, maybe even someone breaks into your home and steals your system ? Backup is very important as well as having decent antivirus.
Nice system setup, good luck to you Matt99 !