Wanna upgrade old PC into a budget gaming PC. Needs advice

Approximate Purchase Date: anytime

Budget Range: < $500

System Usage from Most to Least Important: Gaming, running PS2 emulator, leaching and seeding 24/7, watching streaming prons

Parts Not Required: CPU, mobo, DVD, keyboard, mouse, monitor, speakers, OS

Parts Preferences: Nvidia (I've been told that PCSX2 likes nVidia cards), "no" to all Korean brands

Overclocking: No

SLI or Crossfire: No

Monitor Resolution: 1366x768

Additional Comments: I wanna play Fable 3, Saints Row 3, Dragon Age 1 + 2, Mass Effect 1 + 2 + 3, Mafia II, The Witcher 2, Shogun 2: Total Wars, Assassin Creed 1 + 2, Civilization V.
Also needs large storage and power saving

My old PC:
CPU - i3 530 @ 2.93GHz
Graphics Card - none (using the i3's HD Graphics 1000)
RAM - 1 stick of 2GB 1333
HDD - Seagate 500GB (almost full)
PSU - 390W Cooler Master, dying and making high-pitched noise
Case - No name cheap tiny case, big cards will not fit


Planned to spend $2500 ~ $3000 on Ivy Bridge but I think I'll wait for Skymont.

Thanx in advance.