Thanks all for the informations. Actually I got such high prices for first that the game's budget could not contain.

So we decided here to create the map by ourselves. We created this one : http://chaor.com/chaor_map_detailed.jpg

We are quite satisfied with it. (it is basically needed in the game intro video, for a few seconds) What do you think ?

I'm really interested in the opinion of experienced cartographers. Is this maap acceptable for a low budget online game, or should we buy a more professional map?