@Hiker: I have reserved Pythium but I can also play Abysia as I originally planned so you can have Pythium if you want and we can all be happy
@gowb: Worthy Heroes improves most national heroes in the game and adds a couple of new ones. To install it, just unzip the files into your dom3 folder and then activate the mod from the game's starting menu (preferences->mod preferences->worthy heroes). If you have done everything right, worthy heroes logo appears into upper right corner of the starting menu.