IMO I would wait a bit longer. No one knows how it will perform on what hardware. There are some things you can buy now as you know they'll still be good components in a month, but other parts like GPUs are expected to have price drops, and potentially new SKUs launched.
In my opinion, you could safely grab everything but the CPU, mobo, and GPU now.
Intel i7-950 (Slightly better for overclocking than an i7-930, only $15 more now)
ASUS Sabertooth X58 LGA 1366 Intel X58 SATA 6Gb/s USB 3.0 ATX Motherboard
Antec P183 Mid Tower ATX Case
$593 no rebates