The only visa I can imagine that fits your needs if you aren't over 50 is either an elite visa (good for 5 to 20 years), or an investment visa (good for however long you keep the investment in Thailand). A 5 year elite visa is 500K THB. An Investment visa is 10M THB (if my memory serves me right).
The elite visa information can be found at
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The investment visa can be found at
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If you are over 50, you can get one of the "retirement" visas. I'm not an expert at that type of visa though, and I don't want to give the wrong advice.