Replaced the german map on my f900 but there is no more german map now.What did you do exactly du get the new maps running?
AFAIK new maps should only work if you have the fixed EZRider executable and license files.
You can have multiple maps for the same country, and iGO is supposed to pick the newest one.
TopMap is, I believe, NavNGo's own mapping company, so their maps should work with iGO, but for Western Europe I think TeleAtlas is a good provider. For, say, Hungary, TopMap would be good...