All three run and mow. I've used all of them. Kids played on them a lot over the years, and have left keys on, so hours are not accurate. Two of them had less than 2,000hrs (now show much more). The other, I have no clue (hr meter showed '100' at purchase... definitely not accurate).
Selling for 40-50% of parts value, because I can't verify hours.
325-D 4wd (25hp Mitsubishi K3D) $2,900
328-D 4wd (28hp Kubota 1105) $3,000
328-D 2wd (28hp Kubota 1105) $2,500
72" side discharge $1,200
72" Rear discharge (with belly plate) $1,500
2x60" Finish Flail $5,700
(full width finish roller, stripes like you wouldn't believe, great for overgrown areas too, extra working deck to go with it).
$9,000 - Price for all (nearly half price) plus additional Groundsmaster 72 parts mower and anything other Groundsmaster related parts/etc. laying around.