I'm building a gaming rig on a $600 budget (I already bought the processor and motherboard so it's now $350) I'm looking to buy a decent graphics card, sufficient power supply, memory, and probably an SSD and HDD.
Parts Not Required: Keyboard, mouse, monitor, motherboard, processor, case
Preferred Website(s) for Parts: newegg.com, microcenter.com
Parts Preferences: One Nvidia card or maybe two (or more) nice Radeon cards for Crossfire, good but cheap RAM, powerful but cheap power supply, as big as an SSD I can get for cheap and an even cheaper HDD
SLI or Crossfire: Crossfire, only if it would be better than one Nvidia card