I understand completely Jim. Heck, it even turns my stomach a bit to think what you must be going through just to consider selling one plane, let alone two. But at the same time, I commend you for recognizing the time for what it is, and for considering Cindy's part in the unthinkable, but very possible scenario.
I was just mentioning to someone on the 150/152 Lounge FB page that lately I've been seeing standard 152s go for an average of $30k-$40k, maaaaybe $50k if the condition and equipment was right, and that maybe an Aerobat might pull in $80k.
That said, those were standard/stock 152s, no Sparrowhawk, no autopilot, and certainly not the avionics you've blessed Sierra with. I'm no broker or expert, but I'd be surprised if you got less than around $85k-$90k by the time it was all over.
I remember, Steve Dunn's plane went off and on the market a couple times. Once was when the final overseas buyer went radio silent for a month or so. Glad they ultimately did take delivery, but hated to see it go overseas. Yep, that's selfish, and I'm not ashamed of it.

I really wish I had the funds or the means to get them. I'd sell '420 in a heartbeat and give some newly-minted local pilot(s) the deal of a lifetime if it meant keeping Sierra in the 150/152 Club family.