That's a tough one for sure. Myself, I seem to end up going with my initial gut feeling.
But only after making a decision, then questioning said decision and turn to talkbass for advise. Then take that advise, narrow decision down, then ask "which one between the two" and take that advise, then thank everyone for the advise, ignore it all and go back to your initial gut feeling. Ohhh K, that didn't help at all.
Ahhhh "the first". There's no other feeling like it. They always seem to hold that special something, never before obtainable. Looks to be a keeper. Then again, I tend to hold on to certain things for ages.(still have my first "proper" bass purchased in 1971)but I digress.
So, back to thinning the herd. The Streamer and Jazz, both great basses. Both very versatile basses, each with it's unique voice. I think I would hang on to those. I like the versatility/options of two pickups. That leaves the P & the Ray. Both a very distinct sound, but pretty much only that sound. Don't get me wrong, both sound good, but by design, kind of a one trick pony. The Streamer is P/J so you can get pretty darn close by soloing neck pup and a little EQ to cover the "P" thing. The Jazz and the Streamer with bridge pickup favored or soloed can get you close to that Ray sound. I know, nothing else sounds like a "Ray" or "P", but we're talking thinning the herd, close counts. If my choice, I would dump the P or Ray. Both are fairly easy to replace down the road if desired. And, with the Ray probably having a more unique sound, I would sell the P.
Wow, that was a long way around wasn't it.
Best of luck. I'm sure whatever you decide will be the right/wrong choice, depending on your mood, for years to come.