It seems there's only one quest left now - Iona's dungeon: as I complete each quest, I tick it off (I am using the quest log from "Steve's Guide to Divine Divinity" published on GameFAQs. As far as gold is concerned, I'm not strapped for cash, I have over 300,000 gold in my cabin and over 15.000 in my inventory!
As far as by base is concerned, after George was killed, I took over his house in Aleroth, and you should see the amount of loot I have stashed in there! As I said in my post "Stuck on treasure reward of Armour of Larian" in the Divine Divinity English Help/Tips/Tricks section, I got some valuable information on how to complete another quest (the Sword in the Stone" from the Easteregg section.
I have been wondering though, is there an entrance to the Poor Quarter of Rivertown from the Rivertown Sewers? I have read in various places that this is the case, but to be honest, I can't find any such exit from the sewers.