I don’t see how a surger protector would help with fluctuations, only large spikes.
I agree with Bigee, run a separate circuit and try to choose the leg of the panel with the least amount of high draw appliances. But you would still have to have a surge protector and a conditioner would be icing on the cake. I actually make occasional stops at the office supply stores and have found APC power backups dirt cheap on the clearance rack. You can run the HTPC off the battery protected outlets and the tv off the surge only.
