I am considering buying a generator for home back up/ occasional job site use. I have done some calculations on what size I want/need and I am looking for a 8,000-12,000 watt generator. I have looked on ebay, amazon etc. and the prices vary a lot. I know their must be a reason the cheap ones are cheap but I'm not sure what to look for. I don't expect I will use it a lot but at the same time I know from experience that I don't want to buy junk. I want to buy one and still have it 10-15 years from now. The noise factor seems to be important to many but it really is not that important to me. Any info would be appreciated.