I'm with you on Xandria. Of all the recent female fronted releases, "Sacrificium" is probably my fave (and Dianne has become one of my favourite female voices in metal - she sounds just as great live!), followed by "Savn" (Savn), "The Human Contradiction" (Delain) and "Argia" (Diabulus in Musica) - so far the big surprise for me this year in this genre. I still haven't listened enough to Epica to rate it, but so far I've found Xandria, Savn, Delain and Diabulus in Musica more enjoyable - my gut feelings tells me Epica will rise above or to the same level as some of those after more spins though. The new Stream Of Passion also has potential to be up among my favourite female fronted metal releases this year, but I need to listen to it more to really judge it.
Btw, have you heard a band called Ancient Bards? I knew their singer Sara Squadrani from the last Ayreon record, but hadn't heard her own band until last week. I was pleasantly surprised! Being on Limb Music Records, I expected them to be crap, but they are actually VERY good. Sara has an outstanding voice!!!!