On a recent post (can't remember if it was this group) someone said you can get a Cambodian retirement visa for $300 then it is easier to get various visas in Thailand.
I will be interested in seeing a definitive answer to your question. I am arriving in November and am going to Laos for a week after my first 90 days, then after my second 90 days I will move to Cambodia away from the madness that is the Thai visa restrictions...