We are lucky in that our house is just one level will sort of its not double storey.
I too can use any of the Dyson's , infact any machine I want Kirby's , Rainbows , sebo,s( I don't sell these we just have traded in ones ) the works but I like the dc14 the most.
We had a black one in for the USA 110volt To SA 220volt conversion , looks very stealthy