Really sad to hear this, but we've just made the same decision. Just waiting now for them to come and collect our Spider LE before I post my farewells.
I don't know if it's the dealers, ARUK customer service, or the product quality that's the problem (probably all 3 to some extent) but it's evident on our experience that Alfa do still have a problem. Disregarding the hesitation issue, we only really had a problem with the roof but it was a problem that seemingly couldn't be fixed even after 8 return visits to dealers, hours on the phone to ARUK and so on. And for most of the time we've had the car, we haven't been able to use the roof. Which kind of undermined the point of having a convertible - especially when each month you see the direct debit go out to pay the lease on the thing.
Even worse, we'd formed a real emotional attachment to the car (which is tragic I suppose) and personally I get a bit upset seeing it on the drive, reminding me of the hopes we had for the car as well as all the hours I spent polishing it.
There's still nothing available for less than £90k that's anywhere near as good looking, rare or interesting so it makes me really sad to finally accept it's a lemon and got to go. And that, like you, we'll likely end up with something dull and German instead - but something that works properly, or not replace it at all.
The Scirocco seems like a step down (especially with the Golf dash), and in any case my wife had her heart set on a convertible. Just can't bring ourselves to consider a TT, or worse still Z4 or SLK. Don't like four seater charabancs either. And every man and his dog has a Boxster. So there's really nothing out there.