Hugh's asked me to comment on the Scala. I'm afraid that I can't really help that much. I've not played one of the more recent models, but those Wersis I have played, I have found pretty awkward to get around. That was in the days before the humongous touch screens they now have, and I'm sure that makes a big difference. They are incredibly flexible instruments and I guess that's one reason why they are a bit complex to drive. As far as sounds go, they're as good as anything else in this digital age. But I'd back my Roland AT900P against it for some groups sounds, notably theatre and classical organs and strings.
I am a bit surprised that you didn't get on with the Genos's organ sounds. Too late for yourself, but for the benefit of others, they are all in there, from Hammond, to Wersi and Lowrey in the electronic genre. And if you start mixing and matching you can recreate vintage organs like Gulbransen, Thomas and Baldwin. If you ditch the 'Real Rotor' tremolo and go back to the superior 'Dual Rotor Bright', then tweak the parameters, you get a superb Leslie effect. Theatre and Classical sounds are a tad limited out of the box, but play around and you can extend that considerably. Alas, it isn't all there out of the box and many owners never get to discover what's there. Indeed, a lot of owners stick to OTS and Playlists for all their sounds. Easy to do, but missing out on a lot. I wean my students off that very quickly!
Tony White at Bonners did a quick Youtube video on getting to some of those sounds. I was going to do it but our schedules didn't allow!
Back to Wersi and the trouble with having no physical dealerships in the UK means that you can't just go and try one. You might find a Wersi users group with a member near to you who will no doubt be delighted to show you their Scala. Other than that, to 'try before you buy' might mean a short holiday in Germany.