Mr_Gibblets: Not just the english version of 5 but 4 would be good start.
I have a copy of 4 in cd but my laptop sadly won't read the disc.
I'm sure there are other ways to get part 5, although i haven't looked yet.
There are no legitimate ways of getting the English version of Simon the Sorcerer 5. There was no English disc version and those who sold direct download don't do that anymore. Even if you own the English direct download copy (like I do), you have to crack it if you want to play, because the DRM activation page is permanently down. German disc versions are still available, but AFAIK those don't include the English voice acting.
GOG is trying to get Simon 4 back to their catalogue (they lost it because of rights issue). I hope they are successful in that.