Hello Ben. Don't know where you're based, but as 'The Bassist' suggests, a visit to a well-stocked retailer might prove useful. I've said before, that Overwater make some of the best basses out there, so a trip to Carlisle (maybe you live thereπ€), would allow you to try some of their 'in-stock' models, so you wouldn't be buying 'blind'. Also, Warwick can give you 26 frets, but the weight of a Thumb might be a bit much. Good luck whatever happens.