For my uses, I've never planed to be a GREAT guitar/bassist, so the extent of my bass-playing will probably be in small church jazz combos (NOT gospel, I just wanted slap for my home studio projects). I actually got to play an Ibanez Mikro recently, I like how it feels- it's not too huge, it can get some nice gnarly sounds... I'll keep looking around!

Something to also consider is passive/active pickups. I got a nice bass from a friend years ago that had active pickups that never gets played because I hate batteries. If I leave them in it and forget they may leak.

You have a synth. No, it is not a bass, but you do not have to buy strings for it or anything else. If it has bass synth patches for sound, then it will still be enough to do the job for maybe a few years yet.
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Well in reality I wanted to get decently proficient at it where I could have fun playing it like I can on piano... maybe it isn't necessary tho

Well, that is up to you, and aching fingers playing those big thick strings.

 Well  I had a Gibson SG 5 string bass at one time, only would consider a Fender Jazz type bass or Gibson EBO type bass (Epiphone) whatever make whatever is made.