For those two points.
1) Maybe look for a BB425 as it is cleaner with no scratchplate but I understand what you mean about the mainstream J shape seeking more familiar.
2) While the Sire pre amp gets rave reviews, if you don't want to deal with batteries the Sire can do passive mode but is it worth having the active option there if you don't plan on using it?
I've got a 425 so I am slightly biased but they are great basses, the newer ones are great too, slightly lighter and the body shape is slightly smaller too.