I'd go for the Gatling blaster for sure, simply because it looks so good, but yeah the choice for what to put on the other arm would be hard as the Laser Blaster, Volcano Cannon and Melta are all good options and I like the look (even if they'd get much less use) of both the Power Fist and Chain Fist too! Arrgghhh. Awesome prize that I'd love to win, even if I have no idea where I'd put it once assembled.