I think pretty much any of them would be pretty sick. But to me, the idea of a cover is to play a song everyone knows and can sing along to. So, based on that, there's a few songs I would definitely not do, like Latormeri and stuff.
I picked Talk Dirty To Me on the poll, 'cause I think everyone would know it, it would sound good live, Roope's solo in it is incredible, and it's just a fun song. Several other's that I think would work really well, but maybe just aren't as well known are Ghost Riders. I bet that would sound incredible live. And it would be cool 'cause it's definitely not a metal song. I think a lot of people wouldn't react well to the Britney cover, and ones like Aces High or Bed of Nails just seem too obvious of choices. And I really like the Don't Stop At The Top Cover, but I don't think it'd be that good live... So I think TDTM is the best overall choice, even though I'd like to see several others, myself.