I'm currently looking to upgrade my Alienware by outfitting it with a new motherboard, RAM, Processer, and Video Card (No need in letting my awesome tower go to waste). I want to keep everything to around $500 so this is what I've been leaning on. I use my computer primarily for video editing, sound editing, and gaming.
I also hear that the HD 4850 runs very hot, so I'm not sure if it's necessary to buy a heat sink as well. If so, which one should I look at? And do I need additional cooling for my processor if I don't plan on overclocking?
Additionally, I currently have a 450 watt power supply and I'm not sure if that will be sufficient for the new upgrades. Will I be needing to upgrade that too?