I have two films scanners, both however out of production: HP Photosmart (2100dpi) and Minolta Scan Dual IV (3200dpi). The latter showed me how poor my camera's lenses were... Some images taken in 1995 with a Tokina 28-70mm were much sharper than those taken later with a Sigma 28-80mm, and my older Canon SLR produced great images with its 28 and 50mm lenses, the problem being that images taken over 20 years ago naturally show a decay (even though I keep drier bags next to my slide boxes).
The best choice would be a Nikon, for sure. Maybe you can get a second hand one?
Regards,
Adelaide
PS: My experience with flatbad scanners for slide film was disappointing, even using an expensive model from HP with its proper adapter. If it's just screen resolution you need, it's ok, but it can not produce good high res scans, despite the specs.