Re: Seeking advice on a guitar with locking trem
You could always look for a Jem 505, which pop up once in a while. It's a Japanese basswood Jem, and depending on how you got on with the pickups might not need anything. I have one, and they are great guitars and usually run around 1100-1300 US. All that's missing from a 7 series Jem is the scallops and Dimarzios (and the vine, but you don't play the vine).
But as others have said, I wouldn't sink any money into the Jr. if you have other options.