Choosing a Skin

I recently purchased RP to buy my friend some skins for his birthday, and as I have some left over, I was wondering which legendary skin I should get:

Brolaf Blood Lord Vladimir Gatekeeper Galio Infernal Nasus

These are all champs I own, and I'd like to think I play them all fairly well, so using experience as a category isn't a big option. Any input or personal preference is welcome, as I am extremely indecisive on this matter. Thanks a bunch!