I personally love some of the Alien Conquest sets. However, I got the 2 basic "cheap" sets, Alien ??? for 4.99 and Alien Defender, 9.99. Also got the UFO at 29.99. I think you'd be happy with the UFO for one good Alien Conquest set, then save your cash for the other sets you mentioned. You could also look at the Alien Tripod for 19.99, it may strike your fancy.