really depends on what you mean by pop music? You talking Britney spears or your talking pop punk/Rock as in fallout boy, ashley simpson, nickleback etc....?
The Lonestars great in low gain and cleans. This amp would be great for the Britney spears style of pop with mostly cleans. (remember you can get these cleans on the roadking/roadster)
The rectifiers, newer rec's have good cleans, Roadking/roadster will give you a best of everything, great cleans, good low gain britt and then the recto growl, this amp can cover almost everything.
The stiletto, great clean, great rock amp.... With a boost and some scooping can easily get into heavy territory, this is a great amp for in between Pop and Pop punk/hard rock.
So basically if money is no object i would go with the roadking, being able to switch in the EL34's for britt mode is great, however if money is a problem then I would get the roadster. If you think you are never going to get into the heavy side of pop, such as nickleback, fallout boy etc.. then I would get a stiletto.