Nice cards mate, titans may have lost but at the moment its abit of a sucky time to be a panthers fan god that was a shocker. As Nathraider said, sharpies are best for signing, i personally use a fine point one - have both silver and black - both are very reliable. Also, before getting cards signed here is a tip. Rub the card with a normal eraser, and then the marker sticks to the card much better (takes some of the gloss off the card).
Cheers
Brplat