Thanks everyone. I've thought about it all day and today I decided to accept the job with DHs firm. He is a partner and I'd be an associate but I wouldn't be working for him because he doesn't handle the cases in my area of law. If have my own caseload but I'd also help with their existing issues. I'm nervous but I think I'm doing the right thing. Official Start date is September 15th so I'll be sure to update.
Glad to see you made this decision since I'm late coming in. I can't imagine doing a "test run" of the university, hating it and leaving after a year but that's my mentality and not a general rule.
I've worked with a husband/wife team and in my DH's (biglaw) firm the wife of one of the founding partners (and managing for 20+ years) was the office manager for the lead branch office until a year or two after he retired. In the scenario you set forth, I wouldn't have a problem working with DH. Even though he's a partner and you are an associate, he is not your supervising attorney nor does he work in your practice area so it is unlikely that you will be working together enough to be butting heads. It's unlikely you'll be seeing each other except for in the halls, an occasional meeting and lunch (or dinner if the schedules work).
You and your DH are (presumably) able to keep work and home separate. I don't work with DH but we do discuss his cases (man I miss working so we'd have give-and-take conversations rather than "we went to the playground today" vs. "man this shit client is driving me nuts" - lol.) As I think shoegal said, make sure there is a clear understanding of the rules and roles of work-place relationships in place so there is no confusion or concern over your role as "partner's wife" not giving you special benefits and therefore undermining any credibility you'd have as an already experienced and skilled practitioner, so you don't have to fight harder for it in the future (which would be my main concern about your being hired in the first place...that others would view you as "favored" rather than seeing you as an individual who wouldn't have gotten hired if you didn't have the necessary skills and qualifications.)
I think I'd just work for DHs firm...unless I valued free time/vacation above all else (I probably would but doesn't sound like you do). DH & I worked for the same firm a bit. I worked at home & for someone else's project. It was a non-issue. Eventually we'll likely have a firm together. I think as long as he's not directly supervising you & you do a good job, it'd be fine. Good luck.