With Eleanor completely off the market, Henry is probably looking at someone who could help him both win his war against Stephen while also helping him build a coalition against France, which would be much more powerful with Aquitaine in its fold and directly threatening Henry's southern borders. More than likely, he probably needs a bride from the north, whose family could more immediately help in his war in England, while also serving as a bulwark against France's northern border. A Boulogne match would be a smart one. That gives Henry both a much closer port from which to access England from France, and vice versa.