Samsung Omnia i910

Just got my Omnia and am liking it so far. Time to buy a bigger memory card as I'm just using the 1GB card I had with my old phone. I'm wondering if anybody is actually using a 16gb card and if they have any trouble with it. From what I'm seeing, the 16gb cards only come in class 2 speed. Will that be a problem? Should I go with an 8gb class 4? I'd really like to get that 16gb storage, but not if I can't play my mp3's or movies off of it. I played a movie off of my 1gb card, which I can only assume is class 2 since it's so old, and it played fine, but I'm worried as I add more applications and files if speed will become more important later. Anybody with any advice?