From a technical standpoint, I agree with the earlier posts with concerns about some of these designs translating well to screenprinting. I wonder if the mod in charge of this took a sec to send the art to whomever will be producing the shirts to do a quick check to see if they have any concerns with production of any of these designs. There are a few different ways to "print" shirts, would really kinda suck if whatever design won wasn't able to transfer to being printed on a shirt well.
That said, I actually chose #1. When you're at the grocery store and you see a cool shirt do you really take note of a website on it and check it out later? *I* kinda feel like putting information like that, or phone numbers on a t-shirt is not terribly important. It's a shirt, not a business card. JMHO.
And was there any rule that said the winning design couldn't be modified? Of course that makes the choosing that much harder...