i want to make a quality copy of a cassette

i want to make a quality copy of a cassette i have from 1974 - what software do i need to accomplish this. i have imac mac os x 10.6.8.

i have quick time player, pretty basic.

i also heard about an app called TAPEDECK. Quite expensive, £13.99..any good?

I only have one cassette tape to copy so do not want to spend alot of money but will do

if i get alot better quality.

regards

RC Smudger