Pilou, you can use fusion 360 for free durin year, there is enthusiast license. It is great software, but it depends on internet, also it has no short cuts and scripts, also it has very unconvinient navigation in viewport. But it is really great app it has everything that I dream to have, but can not use it becouse of things I described. Also I do not know how many pollys it can handle, but you do not need a lot of pollys it is better to import low poly model for conversation.