I can answer with two more brands LightObject out in Sacramento and Rabbit Laser USA over in Ohio. Both can supply you with first rate machines and support. As you have discovered the eBay machines are very poor and very poor support. Some who have experience have done direct import.... but No support and no parts in USA. You want fast and accurate, power not so important for card and paper stock, but who knows where your business will take you?? Do not build your own, unless you have nothing else to do.... if you design, cut and sell that is where you money is at. At one time I was going to build my own, but did the numbers and IF you want to have a hobby that's fine, or would you rather make money?