Yes, they are fit into the case, the case can support the max. GPU length=10.5",
http://www.hardwaresecrets.com/article/Antec-One-Case-Review/1494/6 and your GPU dimensions=10.35" x 4.96" x 1.50".
And you change some parts for you 1) Best MB Asus M5A97 R2.0 ATX AM3+ 2) 8RG 2133MHz 3) Best PSU for less XFX 550W 80+ Bronze Certified. 4) 1TB HDD too. And the final budget is almost same $720.91. Also you may think about to buy the aftermarket cooler.
PCPartPicker part list:
http://pcpartpicker.com/p/26PHk
Price breakdown by merchant: http://pcpartpicker.com/p/26PHk/by_merchant/
Benchmarks: http://pcpartpicker.com/p/26PHk/benchmarks/
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Amazon)
Motherboard: Asus M5A97 R2.0 ATX AM3+ Motherboard ($94.99 @ Amazon)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory ($64.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($58.99 @ NCIX US)
Video Card: MSI Radeon R9 270X 2GB Video Card ($219.99 @ NCIX US)
Case: Antec One ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($25.99 @ Newegg)
Optical Drive: LG GH24NS95 DVD/CD Writer ($15.99 @ Microcenter)
Operating System: Microsoft Microsoft Windows 8.1 - 64-bit - OEM (64-bit) ($99.99 @ Newegg)
Total: $720.91
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-22 21:34 EST-0500)
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