Yes, Yes and Yes again
I'm pritty sure we've got some people on here powering far more than this on a hx520
EDIT: only reason I'm useing a 700w psu is because I got it in a halfprice sale
It look like it, but it's not needed, the thermalright ultra-120extream does fit in the p182 with about 2mm to spare (from the side pannel) it's a tight fit but it does.
Depending on how confident at building pc's you are it might be best to advoid this one it is large and heavy but a very good cooler.
While Nocturnal fans are good the added air flow over other half decent fans is not massive and personally I don't think the additional money is worth it.
They are nearly twice the price of the sharkoon golfballs and not twice the performance.
Main thing to remember about fans are:
Speed = airflow = noise
larger = more air for same speed
I'd advoid really cheap fans as they tend to be rather unballenced which generate a lot of vibration and that tends to make them noisey.