My old faithful black and decker dustbuster flexi is on its last legs. My gut feeling is to get the new 18v version as I've been very happy with it but also considering a Dyson or gtech multi. Has anybody got any recommendations? Mainly to be used on my awkward stairs which make lumbering a proper cleaner up and down problematic. Also possibly to clean the car if and when I get round to it. Must be able to pick up cat hair.