Gaming computer under 800, tough but not impossible. Just built one myself not to long ago. At the very least, 3rd gen.intel core i5 processor, but an i7 would be best. If you want it under 800 dollars though, you can't get the i7. Next you need a graphics card. I'm a huge fan of the GE Force 660ti. I could also recommend the the 6570 Radeon. Something with a min. 2 GB of RAM dedicated to the graphics card alone. Of course your RAM you need to have 8GB (Two 4GB sticks). You'll have to match the frequency based on your parts. Then comes the smaller (still expensive parts). Motherboard (don't buy the cheapest one, you don't want it to die. I spent 250 on mine. You don't need to do all that. Make sure it's good, at least). Then you need a power supply. MAKE SURE you get the correct wattage that you need. The actual tower to put it all together, etc, etc.