$800 Office/Gaming/Photoshop PC build

APPROXIMATE PURCHASE DATE: (2-4 weeks) BUDGET RANGE: (approx. 800$ after Rebates/Cashback)

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: (PowerPoint, Gaming, Office, Photoshop

PARTS NOT REQUIRED: (case, hard drives, dvd drive, monitors, power supply *OCZGXS600* )

PREFERRED WEBSITE(S) FOR PARTS: (Newegg & Tigerdirect)

PARTS PREFERENCES: Core i7

OVERCLOCKING: (Maybe) SLI OR CROSSFIRE: (No)

MONITOR RESOLUTION: (1920x1080)

ADDITIONAL COMMENTS: (would like to reuse powersupply but am not sure if it is a good idea...)

Intel Core i7-860
http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...

Gigabyte GA-P55A-UD3
http://www.newegg.com/Product/ComboDealDetails.aspx?Ite...

Gigabyte Radeon HD 5850
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

G. Skill Ripjaws CL7 4GB DDR3
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Intel X25-V 40GB SSD
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I've priced this out at about $890 after cashback on some items on Tigerdirect.com and would love to find a way to get this closer to or even under 800$.

Any other suggestions on the build would be greatly appreciated as well. I'm particularly interested in wether I can/should reuse my old OCZGXS600 Watt power supply or just buy something new. I'm also considering purchasing a new case so could use suggestions on something that is inexpensive but is quiet (the fans in my current case are driving me nuts) and has good airflow. An SSD drive is also of importance to me so any suggestions on that choice would also be particularly helpful. THanks!