Oh, absolutely agree - the Sebo is far better value. Only problem with the D4 is that it's huge. I mean, it really is a tank of a vacuum. The powerhead is big too. So if you're wanting a compact cleaner but with a powernozzle, you're screwed.
The K series with the powernozzle would be a good choice though. Or the E series when it arrives.
Tell me about it, I haven't been on holiday in years! Check out teletext holidays online, they had some really good value deals when I last looked.