I've taken to running my PCs off DC/DC converters.
Mainly because I can't make up my mind what size and type of inverter is the best choice.
I have had big problems with these. The universal plugs don't fit well, and I generally shy away from anything using a conventional cigarette lighter plug on boats. Also, HUGE amount of RF noise even with a ferrite. With the DC/DC I could not use the laptop for wefax, and had to turn it off when using the SSB. I could do both with a cheap inverter and the stock laptop power cord. Currently looking for a good, relatively inexpensive inverter as my cheapo inverter has died.