don't get too excited about the wave rom memory. it might very well mean in fact only 32 MB, read the other thread anout this subject.
i have some serious doubts the difference would be so great from GW7 to GW8. rather, it's sounds are better sampled and more cleverly compressed.
but anyway, the best way is to listen to it yourself, and if you like it, all of these does not matter after all.