you have the room size and if you can live with the slightly lower bass output over the Cornwall I'd suggest the laScala's in the Klipsch line. They are much more emotional and have a more "your there" sound then the Cornwall's. the bass has more impact and tone over the Cornwall just a little less deep the mids-highs have more detail, better dispersion, etc. new or used (used with upgrades if older then the AL5).
Another I've used with very good results and are thin towers are Living Voice out of the UK they make some very good slim towers that are some of the most musical speakers I've ever owned. also quite efficient at 94db. Highly recommended but not see in North America much. they make speakers priced from about $6k to a million bucks.
Auditorium Range | Reflex MTM Loudspeakers | Living Voice
Another I've used with very good results and are thin towers are Living Voice out of the UK they make some very good slim towers that are some of the most musical speakers I've ever owned. also quite efficient at 94db. Highly recommended but not see in North America much. they make speakers priced from about $6k to a million bucks.
Auditorium Range | Reflex MTM Loudspeakers | Living Voice