I think that's a lot of money for two cameras that aren't that desirable and not terribly rare. It's not that they're bad cameras, but there are better alternatives for the money. Neither one of those cameras would get much attention on Ebay or at a swap.
The 28 is the low end: no Auto-parallax compensation; no override, and a slower F2.8 lens. The 25 is also a cheaper version of the QL17. Both are overpriced, and go for ~20 on Ebay. But buy from a seller who has checked it out.
The QL19 is overlooked and has the best features of the QL17.