Kathy,
First of all, have you updated the drivers for your current scanner? And how, other than total non-functioning, do you know it WON'T work with your new Mac?
I have a Canon Lide 500F and that works well with Leopard on my Intel iMac.... I just had to update the driver and the "Canoscan Toolbox' software.
If you've had a good 'working relationship' with the Canon scanners that is probably where I'd look first.
Best of luck.
BOb K. rnkiii