Miele would still get my vote everytime over the other two brands even though there are little foibles like service and info is still restricted despite current legislation on the right to repair. You can now look up appliance explosions on their web site.
The Miele outlet at their Abingdon shop is deffinately worth a go as the prices are good and presumably backed up by thier warranty. I notice they have a WCD020 8kg 1400 spin very close to your top end budget.
Don