Goldilocks here: level PRINCESS!!!
My dirty dozen Deal breakers:
1) String spacing greater than 17mm is a nightmare. I can't play an ER bass with wider spacing. I gave up on a Bongo 6 for this reason
2) If the neck is too round, I can't play it (the Warwick basses I've played always feel like the neck is too round, and my hand starts cramping as I zip along)
3) If the neck is too wide, I can't play it - the other reason I gave up on a Bongo 6
4) 6 string only (it took me 3 years to unlearn that the bottom string is "B", "not "E")
5) I have to carry my bass high I can't play it if its at my waist or lower - my straps are all the EXACT length
6) It has to be a double cutaway body, the hump that many newer basses have looks like a goiter or some kind of unchecked benign tumor .. ewwwwww
7) I have to play roundwounds, period
8) I have to have Dunlop straplocks
9) All the gear I buy is matched. All of my amp stuff matches (all Trace Elliot from the same era), all my pedals match (all Markbass except my Korg tuner, which makes me NUTS so I'm getting a Snark), my guitars are both Yamaha RBXJM2's both in purple plum metallic, both with the same strap, straplocks, strings and cases. So I don't care about other amp manufacturers, other guitars, or other pedals. Cuts down on GAS.
10) My guitar cables must match: Green straight to right angle from the amp to the pedal board, all yellow right angle cables there, then a purple straight to right angle cable from the tuner back to my guitar.
11) I have to use Warwick Rock case flight cases for my guitars - nothing else, no gigbags, ever
Also, I have to have Coke Zero to drink at practice - 2 20 ounce bottles.
Yeah. If I get wound up any tighter my head will pop off and fly about the room making rude noises.