I am wondering if this is the card I want to put into this build or if there is a better recommendation staying under $200.00 US. Asus M3N78-VM Mother Board, 500 Gig Hard Drive, 8 GB DDR2 1066 mhz Ram, AMD 3.1 GHZ Dual core Processor, a 500 watt power supply, 5 fans total inside my case, two 120mm and three 80mm, and Ultra X-Blaster Black ATX Mid-Tower Case.
I think the 4870 is a great choice for you but, if you have a little more cash i'd get the Ati Radeon HD 4850X2. It performs better but it might not be a good idea because of power consumption, i'm not very knowledgeable about how much power it uses. If it will run on a 500 Watt power supply, i'd go for it. Is your power supply a quality brand like Corsair? it might handle it then