100+ Running Tips: No. 133: Use walking intervals to extend your runs, letting you discover new places. Starting running or training for a marathon? Tips and help: Get more running tips and training adivce
The LifeSpan TR1200i is a decent option in this price range. It competes with the Nautilus T614 in terms of price and specification. From a mechanical perspective, the T614 is the better bet. However, the 1200i comes with a much better warranty. So it either comes down to how far you want to push your machine, or to how much protection you want in your purchase.