Posted 09 November 2011 - 05:45 AM
No you can't mess things up by getting too powerful a PSU ;) Dell's of that age use standard (ATX) power supplies. I'd go for good quality ~400w unit such as the Antec Earthwatts 380w, the Antec High Current Gamer 400w, the Corsair CX-500 or Silverstone Strider 500w (amongst others). If you're in a country with a good selection, just grab an Earthwatts 380, unless you're planning on upgrading your graphics card, in which case a ~500w unit would be good.
Quality is important, so if you do decide to grab another type of power supply these brands (there are others but I don't have all day to remember them lol): Silverstone, Corsair, Enermax, Lian Li, OCZ, Seasonic, Antec, PC Power & Cooling and Zalman are the ones to look for - as they basically don't actually make any dodgy units whatsoever.
i7 860 @ 4.0Ghz | Prolimatech Megashadow & 120mm Gelid | MSI P55-GD65 | 8 GB G.Skill DDR3 1600 CL8 | Sapphire AMD HD 6970 (flashed from HD 6950) @ 910/5600 MHz | 2x 160GB Intel 320 Series (RAID 0), 1.5TB + 2TB Seagate | Corsair AX-750 | Silverstone TJ10B-WESA | Samsung 2443BW | Logitech G19 | Logitech G500