Can I have some suggestions on a good graphics card that will fit my case?

Hi. Honestly I must say this. Sell this pc away. Adn let us know budget for new build.

That is best way to go towards what Id call "real gaming build" What you have is really not a gaming PC.

Id build something like this. Cheap fast and good quality parts. DVD is + 15$ + OS.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($219.99 @ Newegg)
CPU Cooler: Thermalright Macho-120 73.6 CFM CPU Cooler ($45.99 @ SuperBiiz)
Motherboard: Gigabyte GA-Z87-HD3 ATX LGA1150 Motherboard ($114.99 @ Microcenter)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory ($68.00 @ Newegg)
Storage: Sandisk Ultra Plus 128GB 2.5" Solid State Disk ($89.00 @ B&H)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: Gigabyte Radeon R9 270X 2GB Video Card ($204.98 @ SuperBiiz)
Case: Fractal Design Define R4 (Black Pearl) ATX Mid Tower Case ($89.99 @ Microcenter)
Power Supply: SeaSonic M12II 850W 80+ Bronze Certified Semi-Modular ATX Power Supply ($109.99 @ Newegg)
Total: $1002.91
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-22 17:25 EST-0500)