...I notice the lights flicker occassionaly when large appliances turn on...
I'd hardly classify your ~100W transceiver as a large appliance, though. *grin*
And I surely hope your lights don't flicker when you transmit, if they do, call an electrician *yesterday*.
As for Transient Voltage Protection of your rig, a good absorber strip that is fresh should do the job for you. "Fresh" is indeed important, as the MOV devices used in them can indeed lose their protection value over time and with too many spikes absorbed.
Other than that, you're larger concern would be lightning strike to the antenna or ground system and not a transient on the AC line.