We’ve had cheaper ones previously and find that although they might look good on paper, with tons of features etc. They don’t take daily use that well. The Reebok above and Nordic Track all seem to get good reviews and have excellent warranties.
It must have:
speeds 16kmh +; good spares availability; good warranty.
Have a look at Beny Sports on line. They supply many of the major players (Certainly used to do Reebok, not sure now?) and if you give them a call they’ll probably have some ex-demo or return stock at reduced prices.
My friends Graham and Richard work there. They sorted my Fire Station out with a 1.5k treadmill for a fraction of the price.