You're getting some particularly good advice here - especially that even the best scanners are effectively worthless without top quality software as speechless ably demonstrates.
The other point to make is careful storage of the originals. The archival properties of stock, especially dye sublimated processes like kodachrome, are astounding. Our family's collective transparency archive goes back 60 years now.
In contrast, my digital imaging only goes back to 1994. Everything I shot through a CCD from 1973/4 and for the next 20 years effectively gone due to the radical and constant changes in storage media. Be careful with your originals.
Rob