Hello i was wondering why vista is not a good Operating System i have the best vista there is on my newly built computer and it runs decent i have my mobo max out here are my entire specs is it all compatible with vista?

XFX Nvidia 780i SLI Motherboard
Running 3 XFX 8800 Ultra's 2.3 ghz DirectX10
CPU:Core 2 Duo Extreme 3 ghz
RAID:Running 4 1000 GB SATA Hard Drives Western Digital
PSU:Ultra X3 ULT40070 1600-Watt Power Supply
Sounds:M audio Audiophile 192 24-bit 192KHz PCI Interface High-Definition sound card
8 GB 800 MHZ Kingston RAM here are the specs for my ram
Kingston 2GB RDRAM Memory Module - 2GB - 800MHz PC800 - ECC - RDRAM - 184-pin RIMM
My Speaker's:Logitech G51 155 watts RMS 5.1 Surround Sound Speakers
My Monitor: NEC Display Solutions LCD4020-BK-AV 40" 16ms DVI Widescreen LCD Monitor

Game's I play:Call of Duty 4,Bioshock,NR2003,NFS Pro Street,Halo 2,GTA San andreas,Half Life 2,Sims 2.

Is this a good system build and is it compadible any answers would be awsome thanks :)