I'm trying to put something together for someone else and I had a question (of course).

Is it possible to upgrade the i7-860 to an i7-920 and the 9500GT to something more powerful?

Help would truly be appreciated.

Here is a list of the computer parts:
Antec Sonata III Case with 500W Power Supply
ASUS P7P55D-E Pro ATX Intel Motherboard
EVGA GeForce 9500 GT 01G-P3-N959-TR Video Card
ntel Core i7-860 2.8GHz LGA 1156 95W Quad-Core Processor
G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory x 2 (for a total of 8GB); the amount of RAM you choose is optional.
OCZ Vertex 2 OCZSSD3-2VTX120G 3.5" MLC Internal Solid State Drive (SSD): This SSD isn't strictly necessary, but in our opinion, SSDs are one of the best upgrades you can make.
Seagate Barracuda 7200.11 1.5TB 3.5" SATA 3.0Gb/s Internal Hard Drive -Bare Drive
LITE-ON DVD Writer - Bulk - Black SATA Model iHAS224-06 LightScribe Support

The link is here:
How to Build a Hackintosh Mac and Install OS X in Eight Easy Steps

Going to be used for heavy video editing.