Personally, I swapped the Botroas for Bataroas and Gaeroas for Lugoae in the Gallic starting armies (I figure the result's about even, as the Bataroas are tougher and the Lugoae weenier). Never could quite get my head around the way Transalpine armies seemed to be filled with troops only available in Cisalpia, and the total inability to retrain was annoying...