Pretty much large city east of DFW is easy to the DC Metro area, though depending on the market your best bets might be IAD, BWI or DCA. Pretty much any large city period is easy to the NYC Metro area, but once again, depends on where you're coming from. Do you have someplace specific in mind?
A commute to DC or NYC will be much easier if you are starting east of the Mississippi River unless you are in a city with an airline hub.