I like the first one, i think you could improve 'rt'; also did you try AVANTICart instead of AVAnTICart?
I'm not sure about superhero: the idea is good, but the way it sounds is makes me feel uneasy and I don't think I would trust a company who had it in their tag line, but hey it's just me.
What font did you use? I like the letter A!:-)
Good luck!

