Looking for ideas on the optimum processor & GPU for new high-end desktop PC. Mac is not an option for several reasons. Looking for optimum performance with Lightroom and Photoshop as well as other media software for audio recording and editing (Audition, Sound Forge, Nuendo), and SD/HD video editing (Premiere Pro, Vegas). Workstation also needs to serve as the originating PC for video conferencing/webcasting/web-based MS application training deliveries using software such as GoToMeeting, Adobe Connect, LogMeIn, etc. The various options I'm looking at offer Intel i7 quad-core, Xeon quad-core, and Xeon hex-core processors, and nVidea Geforce GTX, Quadro 2000, or Quadro 4000 graphics cards. Planning on going with something on the order of 16 to 32 gig for memory, SSD OS and apps disk with conventional HD main storage, and the updated Dell U2713h wide-gamut monitor. Thoughts on the various processor and GPU options that will give top performance with the anticipated software without going over the top into overkill?