PSU placement

I'm in the market for a new case. I want to transfer my OEM HP into the new case for now and later on buy parts for a build later on down the road. My question is: What is the better position of the PSU, top mount or bottom mount? Does is really matter or is it preference?
 

My Computer

System One

  • Manufacturer/Model
    Self built
    CPU
    AMD Athlon 64x2 6000+ 3.0ghz
    Motherboard
    Asus M4N78 Pro
    Memory
    3Gb PC2-5300 DDR2 @ 667mhz
    Graphics Card(s)
    XFX Radeon HD 4770 512mb GDDR5
    Sound Card
    VIA HD Audio
    Monitor(s) Displays
    Dual monitors: HP W1907 LCD 19" and Gateway HD Display 19" LCD
    Screen Resolution
    1440x900
    Hard Drives
    Barracuda 7200.10 SATA 3.0Gb/s 320 x 2-GB Hard Drive
    PSU
    Antec Earthwatts 80 plus 500 watts
    Case
    Ultra E-Torque ATX Mid tower clear side w/2 120mm fans
    Cooling
    Thermaltake MaxOrb cpu cooler w/120 mm blue led
    Keyboard
    OEM HP
    Mouse
    OEM HP
    Internet Speed
    Download 6885 kb/s upload 367 kb/s
    Other Info
    Optical: Super Muliti DVD burner w/lightscribe, Hauppauge WinTV HVR-1800
I'm in the market for a new case. I want to transfer my OEM HP into the new case for now and later on buy parts for a build later on down the road. My question is: What is the better position of the PSU, top mount or bottom mount? Does is really matter or is it preference?

Warm air is less dense so it rises compared to cooler air in the vicinity. Hence, the top of a computer case (or box, or room, or hall) will be warmer than the bottom.

PSUs have an extractor fan. In some machines it's the only extractor fan. Extracting air from the top of the box leads to better cooling because the air being expelled is the warmest air in that container.

If the extractor fan is placed at the bottom of a container, it expels the coolest air, thereby possibly leading to a buildup of higher temperatures at the top.
 

My Computer

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