If you are goIng to upgrade up gpu makesure it has a minimum of at least 256mb, for good gaming look at 512's even 1gb's (don't know if you can't get those 1s for mini mobos though)
as for psu's you can get a decent 400kw one for around £25-30 new. I use a 750 in my high proformance gaming tower. But you wouldn't need to go that high.
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