Alien 3, directors cut, the one where the last hour is completly different but with the same ending? that's a great movie, better than Alien 2 and imho closer to the original as far as Alien horror and suspense goes.
i really liked the 4th movie, apart from Alien getting sucked out into space, or blown out? that spoiled it for me, just too much?
To be honest, I quite like Resurrection until the final act. After Brad Dourif introduces the hybrid.