i haven't heard the atomic reactor, there's also now an alternative, which i also haven't heard, from Tech 21, a powered 2x12 with both jack and xlr inputs. it has 60 solid state watts against the Atomic's 18 valve ones. might be worth a try. it's always good to have more than one solution available.
i have a pod xt pro also, it produces some great sounds at usable volumes. it may not be a "proper" valve amp, but a lot of people that criticise them are just being snobbish. don't be embarrased by it, get a t-shirt!! :P