To be better protected from lightning sourced electrical surges, you may want to consider adding an isolation transformer, between the UPS and the PC.
Something like (although: this one is designed for U.S. power outlet standards):
http://www.ebay.com/itm/252629617227
I am industrial electrician but thanks for the suggestion
But please realize that isolation transformer will never protect you for lightning surge.
Many people use false advertising so them to cash out other people fears.
lightning surge this is so powerful that nothing in this planet can truly protect us from it.
Now if for example this lightning surge some how it is distributed to many homes at the same time due Mains voltage, and this energy comes to your home somewhat powerless 3~6 Kilo Volts, then it is possible isolation transformer or other ( diodes based protection - telephone line), them to withstand the strike with cost their own life.
Surge that came from earth ground it is the trickiest and we are all defenseless.
Neither is safe to operate any computer system with out ground to earth connection.
Now speaking of my case, I did win one auction in Germany and a third (and true healthy) P5QC will be soon shipped to Greece.
Speaking of original topic, as long none of those USB cards can truly replace functionality offered by on-board motherboard USB controller, them my question it is now answered.