Map updated to show Masdus (light greenish blue, northernmost) and Vistuvis (orange, southernmost).
Looking at our locations, we could jointly be maneuvering towards filling up our internal space. It has some empires in it, but at least the western half, south and slightly east of myself, has no massive empires; biggest looks to be jackdaniels. Long term, filling up that area so we can be back to back might be wise. Plus, once we're big enough, we can be hitting empires between us from multiple angles.
http://i1220.photobucket.com/albums/dd457/HiddenAmala/DavesGalaxyLocations-2.jpg