First, congrats on the choice to play the electric as well. I can't play the double bass although I would like to, but to me the six-string electric is the greatest instrument there is
Personally, I find the Ibanez soundgears a bit too narrow spaced, but that's completely subjective. You should really try them out. I think Ibanez has quite good value. their BTB series is the other option, it has wider string spacing and those are good instruments too. I can't comment on the ESP or schecter- Then, I think MTD Kingston basses are more than 500 new but maybe you can find some of them used.
Those basses receive quite much praise here, I think, at least when people mod the pickups and electronics.
My personal favourite from serial producted basses are the older Japanese Yamaha TRB's but the newer ones are quite good also. I think you could find them quite reasonably priced second hand.