OK, basic questions for you; what's your budget? Do not be afraid of the Quote Generator; it is your friend. Do you prefer the powerful 'punch' and lower cost of a set-neck, or the clarity and sustain of a neck-through? How important are the electronics and ease of control/adjustment to you? How much of a concern is weight and balance (body style) to you?
As mentioned in the past, the purchase of a lower priced, pre-owned Alembic with your basic requirements may give you a better indication of what you like/don't like and need/don't need in a guitar. You can then re-sell your 'test-bass', if you desire, to help fund your new bass.
Personally, I went for the best of both worlds...I love my JPJ Signature neck-through with a passion, but my set-neck Orion has that super tight 'punch' that I love, and that I could not do without.
It's a big investment....take your time, and if possible, play as many as you can. (Ironically, all 3 of my Alembics were purchased sight unseen, and I have not been disappointed with any of them; IMO, they're that good)
And finally, pick a dealer that you're comfortable with (Bass Central is my favorite), and let them assist you in your journey.
Best of luck,
Chris