I actually think your concept is going to work great in the group Dark. If you look at the two characters the builds may be similiar, but the personalities are vastly different. While Sarlis has trained himself to be a perfect physical speciman, totally fitting for a priest of Lathander, Ayden is much more reserved and his paragon build stresses the intangibles (charisma) of his personality and his interaction with those in the party.
Also, Finder and Lathander are not exactly the best of friends at the moment, as it was not too long ago that Lathendar tried to sacrifice Finder to merge Tymora and Basheba back into one persona. While the wound is not still visible, the scar still runs deep...
However, all in all, I think there will be alot of room for some great RPing between the characters, especially if you still stay with the priest idea.
Either way, I look forward to getting to game with you, especially since yours was also a game I left. I apologize again for putting you in a bind when I did that...