I am still anxious to build my first PC. USB 3 speeds are very important to me. It appears that native USB 3 on Ivy Bridge will allow USB 3.0 speeds to approach much closer to the actual claimed 5X speed increase over USB 2.0 rather than the 1.5X to 2X current cards and third party chipsets appear to be getting (let me know if I am all wet regarding these numbers).
Case: Corsair Carbide 500R (to get 2 USB 3.0 in front with 2 USB 2.0) and enought space inside
Motherboard: ASUS P8Z68-V PRO LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS to give me the choice of adding Ivy Bridge in the future if I go with Sandy Bridge now
GPU: Asus nVidia GTX 570 CUII (to give me a good Adobe certified Premiere Pro CS5.5 midrange card)
PSU: CORSAIR Professional Series Gold AX750 (CMPSU-750AX) 750W ATX12V v2.31 / EPS12V v2.92 80 PLUS GOLD Certified Modular Active PFC Power Supply
Memory: CORSAIR XMS3 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMX8GX3M2B1600C9
SSD for Windows 7 Pro 64bit and all Programs: Crucial M4 CT128M4SSD2CCA 2.5" 128GB SATA III MLC Internal Solid State Drive (SSD) with Transfer Kit
Data HDD: Western Digital Caviar Green WD20EARX 2TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
Main Blu-Ray writer: LITE-ON 12X BD-R 2X BD-RE 16X DVD+R 12X DVD-RAM 8X BD-ROM 8MB Cache SATA Blu-ray Burner with 3D Playback iHBS212-08 LightScribe Support
Second DVD optical drive: LITE-ON 24X DVD Writer - Bulk - 24X DVD+R 8X DVD+RW 12X DVD+R DL 24X DVD-R 6X DVD-RW 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM Black SATA Model iHAS224-06 LightScribe Support - OEM
Card Reader: Rosewill RCR-IC001 40-in-1 USB 2.0 3.5" Internal Card Reader w/ USB Port / Extra Silver Face Plate
Display: ASUS ProArt Series PA246Q Black 24.1" 6ms P-IPS Height/Swivel/Pivot Adjustable LCD Monitor w/2 USB hub, Card Reader & Display port 400cd/m2 50000:1 DCR (to get a prof. quality monitor that can give me good Adobe colors)
I will be connecting the Asus GPU to the Asus 24" monitor and connecting the Asus Motherboard on CPU graphics output to my 37 inch Sony 1080P HDTV (to project photos to paint from (I am an oil painter) and to test How to painting DVDs that I plan to create with this system).
Waiting will mean at least till March 2012 and result in using Premier Pro 32bit CS4 on my current Dell E510 PC. Building now will allow me to start using Premier Pro CS5.5 64bit right away.
The only advantages to waiting seem to be related to USB 3 functioning since my nVidia GTX 570 would take care of DirectX 11 etc.