The HW40 is a great Choice, the Beeman P3 is the same Pistol made in germany with the same parts but badged as a beeman for the U.S market and is normally a bit cheaper than the HW40, the Beeman 2004e mentioned by Andy is again basically the same but not as good quality and made in china.
The HW45 is a great pistol if you get a chance to try one.