If this question has already been answered, please point my to the thread. If not... My Samlex 600 watt pure sine inverter failed the other day and am using a small back-up for my electrical needs. Based on personal experience, can anyone recommend a quality brand pure sine inverter in the 400 to 600 watt range? I've done a significant amount of research and have a couple of choices, but would like your opinions too. Thanks