Can't disagree with any of the above.
I used to have a 90s Thumb 5NT which was a beautiful bass, but because of the small body shape and the long neck, it did feel slightly neck heavy and not one for people with short arms.
I also used to own a 4 string Streamer Stage 1. The balance of it was definitely better, and it would've been good to have been able to do a closer comparison with the Thumb had it been a 5 string.
The sound of the Thumb is definitely [b]the[/b] Warwick sound, but the Streamer was a far more versatile bass due to the P/J pickup configuration.
As everyone has said above, I would spend time trying out a few different models for yourself before committing to buying one that you end up not being particularly happy with.
If I was going to buy one now, [b]I[/b] personally would buy a 5 string Streamer.....as it's more suitable for what I would use it for. [b]BUT[/b] if I had the cash and it was available, I'd buy my old Thumb back at a second's notice.