After a few month hasitating and not finding time to really begin with it (it has been a really hard deadline weeks).
Unitiy 3D! Thanks reading Twitties and posts of it at everydayflash, today it was finally time to download Visual C# Express. Thanks Bartek for posting the first steps to run it, really looking forward to!
Although I am a Flash/AS3 entusiast maybe beginning with C# it worthes to take a look to Silverlight too!