Should I apply for a new Multi Entry Non O Visa or extend my current visa as a foreign spouse in Thailand?

I would say given the needs of the O/P that a year-long, multi-entry Non-O visa from a thai consulate is by far superior to a yearly extension of stay from the immigration office.

First off, they can get a year-long, multi-entry Non-O visa without proof of funds or banking a single baht in this country,

Secondly, even though he has a valid Non-O now he'd need 2 visits to the immigration office to get a yearly extension of stay due to 30 day the under consideration period for the yearly extension. AND they'd have to buy a re-entry permit after they finally got the extension of stay.

The costs work out to 5000baht for the year-long, multi-entry Non-O visa from the consulate (which lets them come and go for a year getting stamped in for 90 days each time versus 5700baht for the year extension and a multiple re-entry permit.

**EDITED** thanx David :)