OP here. Sorry, after posting, I've been taken up with a number of things. Still, I've read and I appreciate all of the comments. Thanks.
I'm now annually extending permission to stay based on original OA Non-Imm visa. Wife and I had traditional family marriage a number of years ago (sin sod paid, etc), not registered. She has a ten-year US tourist visa (her second). Based on what folks have posted, I'm thinking registering the marriage in Thailand is the way to go in order 1) to change my permission to stay from retirement to marriage (and hopefully not need anymore the annual health insurance expense) and 2) to change her US visa from tourist to marriage. Is this right? One major concern is that if we move to the US later (she currently has family obligations that keep her here) she will want to work there. Will a US "marriage visa" allow her to do that?
Thanks again for your input.