Isn't Martin still set up at Sierra Remote Observatories that is already subject to 1 arcsec seeing year round. An AO unit will only build upon that. Depends on how far you want to take it, but I can tell you that purchasing an AO unit is chicken feed compared to the cost of hosting your telescope on a mountain top that experiences great seeing.
If you want to get the best you can from your site, then I would go for it Paul. There are so many factors to getting sharper images and tighter stars. Seeing is just one of them.