You can go with a cheaper PSU and case. A 500W version of that PSU would be like $15-$20 less. A decent cheaper case can cost like $40-$50. Drop the wifi unless you absolutely need it. --- Big Money. Big Women. Big Fun. Skillz Ferguson
Same PSU but less wattage http://www.newegg.com/Product/Product.aspx?Item=N82E16817139027
I can vouch for both parts because I actually own both of them. PSU is fine for a single GPU set up. As for the case, cable management sucks...but I'm not one of these people that cares about how the insides look. It's got good air flow and plenty of spots for fans. It's large enough to fit some of the biggest GPU cards. Well built. And it's tool-less.
You might be able to get those for cheaper if you shop around some, but those are viable alternatives to what you want. --- Big Money. Big Women. Big Fun. Skillz Ferguson
I don't know about Dolphin, but my 7850 runs Skyrim pretty well. Not completely maxed, but damn near everything on high and 2x AA at 1080p 60FPS with the Bethesda HD texture pack and a couple mods (pouches, SkyUI..nothing crazy).
So base what you want on that. --- Big Money. Big Women. Big Fun. Skillz Ferguson