who to 5*

I have 40,000 feathers saved up and I was planning on building a Quadraven but because of recent developments, things have changed.

My current options are:
BSword Laslow (has wrath)
Titania (already built with slaying axe+ and swift sparrow)
Anna (already fully built with fury and desperation)
Arvis
Est (already has brave lance)
Florina (has sapphire lance and lancebreaker)
Quadelia
Brave Frederick (I already have a Brave Cherche)
Felicia (decked out with def ploy, desperation, and fury)
Eliwood (already has death blow 3)
Xander (basic fury vantage set already built)
Saizo (already has darting blow and watersweep)

I'm very hesitant on who to upgrade and build especially since I don't have any more Fury or Death Blow fodder which means whoever I 5* probably wont be seeing arena action soon