Filip

Here in Poland, Filip is a tad overused, and I don't really like its sound.

I agree that Philip looks better, but acknowledging the fact that not everyone uses English pronunciations and spelling, Filip is nice too.

I've never liked this name spelled with an "F" especially for a boy. It looks girlish (like Filipa) to me if it's spelled "Filip." Philip is a much better spelling and looks more masculine.