Hello and thank you for your question. I look forward to assisting you today. Wow! It sounds like you have been through more than your share just for what would be considered very poor support?? Just to clarify, you are looking for a manufacturer that will provide you with a good hardware warranty and tech support for a new computer purchase, is that correct?
Are you looking for general tech support, or something more specific? If you are just looking for overall software and out of warranty hardware support, then you can find that here.
For issues like you describe, you can get that type of support here. If you are looking for hardware coverage to go along with software support, I would recommend SquareTrade. They are pretty reasonable, usually much cheaper than the manufacturer warranty.