Would this psu and case be ok for me?

Well

I never heard of that brand, but it does have 38amps on the +12v rail which isnt bad and should run your stuff just fine. As far as how good its overload protection is ? Not sure. You get what you pay for when you buy a power supply and it isnt somthing that you should skimp on even on a budget system.

Cheap power supplies fail more often than more expensive quality ones. Usually when a cheapie blows you end up replacing way more than the power supply and you actually end up spending lots more then it would have cost you to spend a few extra bucks on a quality power supply.
 
Good Brand

Antec, enermax, silverstone, thermaltake, corsair PC Power and Cooling and there are a few more but stay with one of the ones listed above and you will be fine.
 
If th wattage calculator worked out 521W then get at least a 600 or 650W PSU.

I wouldn't touch the PSU you posted a link to with a bargepole ;) It's way too cheap for 650W and it will more than likely destroy your system.

I would get this for your pc.i have the 400W version and as far as i can tel it works great.

Another option is this or this
 
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