You wouldn't believe it but
We ended up with neither a Dyson nor a Miele, we ended up with a Vax Fusion bagless for $199.00.
The salesman at the Good guys demonstrated a Miele, a Dyson and this Vax model for usand the Vax outperformed both the Dyson and the Miele, the Dyson took the longest to pick up all the grit and sand from the carpet, the Miele was next best but the Vax sucked it up the fastest.
The Dyson was the noisiest machine, the Miele was lovely and quiet but so was the Vax it uses very similar technology to the Dyson but at a fraction of the cost.
I had a fair idea of what I wanted, but I was so heartened when the young salesman asked me all the right questions, how big is your house, what type of carpet do you have?, hard floors or tiles, and incredibly enough he told us that given what we told him, we would actually be foolish to spend so much money on a Dyson in particular and with the Miele there is the ongoing cost of bags, and of course the other factor was my sister, who was drooling over the Vax, so we went with it.
Got it home and tried it out and I couldn't believe how much extra dirt it picked up given that I had vacuumed only yesterday with the very old L.G. (which had some time ago been retired to garage duty.
Very happy with our purchase but thank you all so very much again for all you tips and advice.