Are you sure it is fried? Did you check the reverse polarity fuses on the output of the converter?
The reason the wfco is a poor choice is that they charge quite slowly and rarely get into boost mode. That may lead to poor battery life (as in number of cycles).
My choice would be the PD which now charges at 14.6 volts in bulk mode. Make sure to get the "wizard" that allows you to control the modes.
You do not want a simple surge protector. You want an energy management system. The best choice may be the Progressive Industries unit, as it comes with a life time guarantee.