$1000 computer

This will be my first attempt at building a pc and i want it to be around $1,000 and i just wanted to know if what i have so far is good for the price and if you guys could give me some suggestions on what i should change i would be very grateful. I am not going to overclock it yet but don't want to rule it out nor am i going to crossfire yet. I would also like to allow room to add on more without having to completely replace something. If you see something that is bad in my build please suggest a replacement. The range of use is pretty broad as this will be the only computer in my house. thanks. The parts so far are:
G.SKILL Ripjaws Series 4GB 240-Pin DDR3 SDRAM DDR3 1066 (PC3 8500) Desktop Memory

XFX HD-577A-ZNFC Radeon HD 5770 (Juniper XT) 1GB GPU

SAMSUNG Spinpoint F3 1TB 3.5" SATA 3.0Gb/s Internal Hard Drive

AMD Phenom II X6 1090T Black Edition 3.2GHz Socket AM3 125W Six-Core Desktop Processor

MSI 890FXA-GD70 motherboard

XFX 650W ATX SLI Ready CrossFire Ready 80 PLUS BRONZE Certified Modular

Antec Nine Hundred Black Computer Case With Side Panel Window

thank you