the Kurdish north will be one of Iraqs most stable economic and political bases.
No other areas will be stable economically or politically for decades to come. Kurdish north might, but it would still be tough.
Well Kurdistan is already stable, if not economically, at least politically. There have been no bombings or major terrorist attacks in the North and they've actually had the guts to release an advertisement promoting Kurdistan as "The Other Iraq". You have to remember that for the Kurds nothing really changed after the invasion. They didn't have to worry about Saddam anymore and they have a bigger chance at regaining cities like Kirkuk and Mosul that Saddam took away from the Kurds. Otherwise they are minding their own business and reaping a foreign investment whirlwind.