I think they’re all great choices. Personally, I don’t like Warwick basses or their owner, so the Thumb is out AFAIC.
I’m assuming ‘new’ means new to you rather that brand new ‘cos none of them are within the budget stated otherwise.
Of the remaining three, I’d probably go Dingwall, but it would be a very close decision between that and a Stingray, with the Bongo as a close 3rd.
That said, I’m very happy with my Lull BBM5 and Status S2 five stringers. Maybe they’re worth considering, although £1500 rules Status out too.