The talent that adds agility equal to intellect is only found in Balance and Resto specs, for Feral and Guardian they have an inverse talent that adds spellpower equal to agility. So if you use Int gear as Feral, your stats will be gimped. If you stay Balance but play in cat form, your abilities will be limited. I'd stay boomy, then maybe once you get the glyph to cast resto spells from moonkin form you can manage with bear and 4x boom?