tremolo bar

I've got a guitar that the tremolo bridge sat flat on the body with the original strings. New sets have it lightly pulled up, floating. I'm not totally opposed to this situation, it still sets up nice. And I can get a bit of tremolo action by just putting palm pressure on the thing. I'm not...

I've been surfing online and found a few 4 string bass bridges with tremolo systems, namely Khaler and Hipshot bridges. There's also a much cheaper, unbranded bridge on amazon. If anyone has experience with using a tremolo arm on a bass, what bridge is the greatest of them all?

I was looking around to get a tremolo bridge for my warwick 5 string, but I couldn't find anything besides Kahler. They're really expensive and I'd like to consider all of my options before investing money into a tremolo bridge. Does anyone here know any other options that I can consider?

I ponder on having a trem bridge (whammy bar) installed in my 28,6" 5 string Ibanez GSRM25 Mikro bass. I tune it up to F# to D, which is to say 2 half steps above standard E tuning, or like the 5 lowest strings of an 8 string guitar, and I use my bass a bit more like you would a Bass VI type...