If you have a house that can/will ship you boards registered between all layers at less than half a mil, and can finish solder mask suitably for .8 mm pin-pitch parts, let alone half mm, to .1 mil tolerances and coherent edges, and at competitive prices, then name 'em. Most of these houses won't even guarantee that they can etch to the tolerance that fine (.003") lines require without over/under etching.