You should ABSOLUTELY remain Excelsia.
Oh man, character relationships...
Errik is best friends with Kratash (now deceased), and respected colleagues with Serin and Grendmir. Grendmir and Kratash were decent enough friends who liked to take the occasional jabs at each other. Adia and Kratash were almost enemies, and have squabbled and almost FOUGHT on several occasions. Which is why it was kinda awesome when even she shed a tear for him. Serin and Adia are the two females and get along pretty well by that virtue alone. There ARE some budding romanticals between Errik and Adia, as first noticed/implied by Bez, Errik's impish familiar. They've never openly addressed these feelings and play it pretty close to the vest. And as best as I can tell, everyone gets along with Saryon okay, but hey, he's our healer, and has done at least SOMETHING to gain respect among is peers. Oh, and Saryon is the only person who believes that Adia may NOT actually be losing her mind.
I think that about sums it up.