FSX / FS9 on XP Pro X64

HelloI am about to make myself a new rig with dual core, etcWhen comes the question of the OC, I am still not sure what to select. However, I want to go ahead and base my set up on XP X64. I think Vista 64 is just an XP 64 with some additionnal multimedia/security features that I don't need.Can thoese who have tried share their opinion and experiences, especially in view of using the following addons.- RCv4- Active sky- PMDG 737NG- Level-D 767- Flight1 Super80- Wilco/Feelthere A320I know about the drivers issue but I think now all new devices have their X64 drivers. This hould be overcome.The question is, is this really worth the risk of trouble?I know that the X64 version allows faster loading, >2Gb RAM and no stutters, yet no increased FPS.Thank you very much.RegardsGhiom