Just put a 500watt PC POWER/COOLING psu in my Dell XPS 420. Now i need a card. I would like to stay with ATI radeon HD 4870 PCIexp. 1024 (unless there is a better way to go) but i don,t know which manufacture is the most reliable( such as XFX, DIAMOND, asus, the list goes on. would like to stay between $200/&300. Thanks in advance Lee