Here's a fun thing, though---a local realtor's site calculating commensurate salaries in a pair of cities of your choosing (within U.S.---there's a link to the international one):
I compared Ann Arbor with every city I know in Maryland and felt better, that I'm not crazy about the cost of living here. Only a coupla the most ritsy D.C. suburbs were pricier than our little college town.