I always have a hard time with "if you had to choose just one 1/48 VF-1" threads because I'm so torn. In your case though, I guess I'd go for the Hikaru VF-1J, that way you have at least one valk of every type available in 1/48 (A, S, J). Also, the 1J is my second favorite head design after the 1S, so that's another point in its favor. I guess I'd recommend the 1J for now and pick up the Kakizaki 1A later if you have some extra funds