R9 290x sapphire

Wattage is only part of it, quality is as important. I would keep the PSU at 600 watts for a system with that card, and nothing lower than a Tier 2 unit. This is good for a good but cheaper PSU https://www.newegg.com/Product/Product.aspx?Item=N82E16817151118 Has a $10 rebate right now for it. If you don't care about it being modular this is a bit cheaper https://www.newegg.com/Product/Product.aspx?Item=N82E16817151096&Tpk=N82E16817151096 and found this one, $20 rebate, a very good deal for that https://www.newegg.com/Product/Product.aspx?Item=N82E16817151095